VERSION 2.00
Begin Form Form1 
   BackColor       =   &H00000000&
   BorderStyle     =   1  'Fixed Single
   Caption         =   "MONTOR System Monitor"
   ClientHeight    =   5145
   ClientLeft      =   15
   ClientTop       =   825
   ClientWidth     =   9150
   ForeColor       =   &H0000FFFF&
   Height          =   6075
   Icon            =   0
   Left            =   -45
   LinkTopic       =   "Form1"
   MaxButton       =   0   'False
   ScaleHeight     =   5145
   ScaleWidth      =   9150
   Top             =   -45
   Width           =   9270
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      AutoSize        =   -1  'True
      BackColor       =   &H00C0C0C0&
      BorderStyle     =   0  'None
      FillStyle       =   0  'Solid
      ForeColor       =   &H0000FFFF&
      Height          =   3225
      Index           =   0
      Left            =   1680
      Picture         =   MONTOR.FRX:0000
      ScaleHeight     =   3225
      ScaleWidth      =   720
      TabIndex        =   0
      Tag             =   "100"
      Top             =   840
      Width           =   720
      Begin Image WarnLevPtr 
         DragIcon        =   MONTOR.FRX:14A2
         DragMode        =   1  'Automatic
         Height          =   165
         Index           =   0
         Left            =   420
         Picture         =   MONTOR.FRX:15EC
         Top             =   3000
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      End
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         Height          =   165
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         Picture         =   MONTOR.FRX:16EA
         Top             =   0
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   Begin PictureBox GaugeMain 
      AutoSize        =   -1  'True
      BackColor       =   &H00C0C0C0&
      BorderStyle     =   0  'None
      FillStyle       =   0  'Solid
      ForeColor       =   &H0000FFFF&
      Height          =   3225
      Index           =   7
      Left            =   8280
      ScaleHeight     =   3225
      ScaleWidth      =   750
      TabIndex        =   7
      TabStop         =   0   'False
      Tag             =   "100"
      Top             =   840
      Width           =   750
      Begin Image CurrValPtr 
         Height          =   165
         Index           =   7
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         DragIcon        =   MONTOR.FRX:17E8
         DragMode        =   1  'Automatic
         Height          =   165
         Index           =   7
         Left            =   420
         Top             =   3000
         Width           =   300
      End
   End
   Begin PictureBox GaugeMain 
      AutoSize        =   -1  'True
      BackColor       =   &H00C0C0C0&
      BorderStyle     =   0  'None
      FillStyle       =   0  'Solid
      ForeColor       =   &H0000FFFF&
      Height          =   3225
      Index           =   6
      Left            =   7320
      ScaleHeight     =   3225
      ScaleWidth      =   750
      TabIndex        =   6
      TabStop         =   0   'False
      Tag             =   "100"
      Top             =   840
      Width           =   750
      Begin Image CurrValPtr 
         Height          =   165
         Index           =   6
         Left            =   0
         Top             =   0
         Width           =   300
      End
      Begin Image WarnLevPtr 
         DragIcon        =   MONTOR.FRX:1932
         DragMode        =   1  'Automatic
         Height          =   165
         Index           =   6
         Left            =   420
         Top             =   3000
         Width           =   300
      End
   End
   Begin PictureBox GaugeMain 
      AutoSize        =   -1  'True
      BackColor       =   &H00C0C0C0&
      BorderStyle     =   0  'None
      FillStyle       =   0  'Solid
      ForeColor       =   &H0000FFFF&
      Height          =   3225
      Index           =   5
      Left            =   6360
      ScaleHeight     =   3225
      ScaleWidth      =   750
      TabIndex        =   5
      TabStop         =   0   'False
      Tag             =   "100"
      Top             =   840
      Width           =   750
      Begin Image CurrValPtr 
         Height          =   165
         Index           =   5
         Left            =   0
         Top             =   0
         Width           =   300
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      Begin Image WarnLevPtr 
         DragIcon        =   MONTOR.FRX:1A7C
         DragMode        =   1  'Automatic
         Height          =   165
         Index           =   5
         Left            =   420
         Top             =   3000
         Width           =   300
      End
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   Begin PictureBox GaugeMain 
      AutoSize        =   -1  'True
      BackColor       =   &H00C0C0C0&
      BorderStyle     =   0  'None
      FillStyle       =   0  'Solid
      ForeColor       =   &H0000FFFF&
      Height          =   3225
      Index           =   4
      Left            =   5400
      ScaleHeight     =   3225
      ScaleWidth      =   750
      TabIndex        =   4
      TabStop         =   0   'False
      Tag             =   "100"
      Top             =   840
      Width           =   750
      Begin Image CurrValPtr 
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         DragIcon        =   MONTOR.FRX:1BC6
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      End
   End
   Begin PictureBox GaugeMain 
      AutoSize        =   -1  'True
      BackColor       =   &H00C0C0C0&
      BorderStyle     =   0  'None
      FillStyle       =   0  'Solid
      ForeColor       =   &H0000FFFF&
      Height          =   3225
      Index           =   3
      Left            =   4440
      ScaleHeight     =   3225
      ScaleWidth      =   750
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      Tag             =   "100"
      Top             =   840
      Width           =   750
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      Begin Image WarnLevPtr 
         DragIcon        =   MONTOR.FRX:1D10
         DragMode        =   1  'Automatic
         Height          =   165
         Index           =   3
         Left            =   420
         Top             =   3000
         Width           =   300
      End
   End
   Begin Timer Timer1 
      Interval        =   2000
      Left            =   120
      Top             =   3480
   End
   Begin PictureBox GaugeMain 
      AutoSize        =   -1  'True
      BackColor       =   &H00C0C0C0&
      BorderStyle     =   0  'None
      FillStyle       =   0  'Solid
      ForeColor       =   &H0000FFFF&
      Height          =   3225
      Index           =   2
      Left            =   3480
      ScaleHeight     =   3225
      ScaleWidth      =   750
      TabIndex        =   2
      Tag             =   "100"
      Top             =   840
      Width           =   750
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         Left            =   0
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         Top             =   3000
         Width           =   300
      End
   End
   Begin PictureBox GaugeMain 
      AutoSize        =   -1  'True
      BackColor       =   &H00C0C0C0&
      BorderStyle     =   0  'None
      FillStyle       =   0  'Solid
      ForeColor       =   &H0000FFFF&
      Height          =   3225
      Index           =   1
      Left            =   2520
      ScaleHeight     =   3225
      ScaleWidth      =   750
      TabIndex        =   1
      Tag             =   "100"
      Top             =   840
      Width           =   750
      Begin Image WarnLevPtr 
         DragIcon        =   MONTOR.FRX:1FA4
         DragMode        =   1  'Automatic
         Height          =   165
         Index           =   1
         Left            =   420
         Top             =   3000
         Width           =   300
      End
      Begin Image CurrValPtr 
         Height          =   165
         Index           =   1
         Left            =   0
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   Begin Shape Circ 
      BackColor       =   &H00000080&
      BackStyle       =   1  'Opaque
      Height          =   735
      Index           =   1
      Left            =   480
      Shape           =   3  'Circle
      Top             =   2760
      Width           =   735
   End
   Begin Shape Circ 
      BackColor       =   &H000000FF&
      BackStyle       =   1  'Opaque
      Height          =   735
      Index           =   0
      Left            =   480
      Shape           =   3  'Circle
      Top             =   1320
      Width           =   735
   End
   Begin Label RowLabel 
      Alignment       =   1  'Right Justify
      BackColor       =   &H00000000&
      Caption         =   "Warn At:"
      ForeColor       =   &H00FFFFFF&
      Height          =   255
      Index           =   4
      Left            =   120
      TabIndex        =   46
      Top             =   4800
      Width           =   1335
   End
   Begin Label RowLabel 
      Alignment       =   1  'Right Justify
      BackColor       =   &H00000000&
      Caption         =   "Percent Free:"
      ForeColor       =   &H00FFFFFF&
      Height          =   255
      Index           =   3
      Left            =   120
      TabIndex        =   45
      Top             =   4440
      Width           =   1335
   End
   Begin Label RowLabel 
      Alignment       =   1  'Right Justify
      BackColor       =   &H00000000&
      Caption         =   "Free:"
      ForeColor       =   &H00FFFFFF&
      Height          =   255
      Index           =   2
      Left            =   120
      TabIndex        =   44
      Top             =   4080
      Width           =   1335
   End
   Begin Label RowLabel 
      Alignment       =   1  'Right Justify
      BackColor       =   &H00000000&
      Caption         =   "Max Value:"
      ForeColor       =   &H00FFFFFF&
      Height          =   255
      Index           =   1
      Left            =   120
      TabIndex        =   43
      Top             =   480
      Width           =   1335
   End
   Begin Label RowLabel 
      Alignment       =   1  'Right Justify
      BackColor       =   &H00000000&
      Caption         =   "Resource:"
      ForeColor       =   &H00FFFFFF&
      Height          =   255
      Index           =   0
      Left            =   120
      TabIndex        =   42
      Top             =   120
      Width           =   1335
   End
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      Alignment       =   1  'Right Justify
      BackColor       =   &H00000000&
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      FontBold        =   -1  'True
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      FontName        =   "Arial"
      FontSize        =   8.25
      FontStrikethru  =   0   'False
      FontUnderline   =   0   'False
      ForeColor       =   &H0000FFFF&
      Height          =   255
      Index           =   7
      Left            =   8280
      TabIndex        =   29
      Top             =   4080
      Width           =   735
   End
   Begin Label CurrValLab 
      Alignment       =   1  'Right Justify
      BackColor       =   &H00000000&
      Caption         =   "0k"
      FontBold        =   -1  'True
      FontItalic      =   0   'False
      FontName        =   "Arial"
      FontSize        =   8.25
      FontStrikethru  =   0   'False
      FontUnderline   =   0   'False
      ForeColor       =   &H0000FFFF&
      Height          =   255
      Index           =   6
      Left            =   7320
      TabIndex        =   30
      Top             =   4080
      Width           =   735
   End
   Begin Label CurrValLab 
      Alignment       =   1  'Right Justify
      BackColor       =   &H00000000&
      Caption         =   "0k"
      FontBold        =   -1  'True
      FontItalic      =   0   'False
      FontName        =   "Arial"
      FontSize        =   8.25
      FontStrikethru  =   0   'False
      FontUnderline   =   0   'False
      ForeColor       =   &H0000FFFF&
      Height          =   255
      Index           =   5
      Left            =   6360
      TabIndex        =   31
      Top             =   4080
      Width           =   735
   End
   Begin Label CurrValLab 
      Alignment       =   1  'Right Justify
      BackColor       =   &H00000000&
      Caption         =   "0k"
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      FontItalic      =   0   'False
      FontName        =   "Arial"
      FontSize        =   8.25
      FontStrikethru  =   0   'False
      FontUnderline   =   0   'False
      ForeColor       =   &H0000FFFF&
      Height          =   255
      Index           =   4
      Left            =   5400
      TabIndex        =   41
      Top             =   4080
      Width           =   735
   End
   Begin Label CurrValLab 
      Alignment       =   1  'Right Justify
      BackColor       =   &H00000000&
      Caption         =   "0k"
      FontBold        =   -1  'True
      FontItalic      =   0   'False
      FontName        =   "Arial"
      FontSize        =   8.25
      FontStrikethru  =   0   'False
      FontUnderline   =   0   'False
      ForeColor       =   &H0000FFFF&
      Height          =   255
      Index           =   3
      Left            =   4440
      TabIndex        =   40
      Top             =   4080
      Width           =   735
   End
   Begin Label PercentLab 
      Alignment       =   1  'Right Justify
      BackColor       =   &H00000000&
      Caption         =   "0%"
      ForeColor       =   &H0000FFFF&
      Height          =   255
      Index           =   7
      Left            =   8280
      TabIndex        =   36
      Top             =   4440
      Width           =   735
   End
   Begin Label HeadingLab 
      Alignment       =   2  'Center
      BackColor       =   &H00000000&
      Caption         =   "Drive F:"
      ForeColor       =   &H0000FFFF&
      Height          =   255
      Index           =   7
      Left            =   8280
      TabIndex        =   37
      Top             =   120
      Width           =   735
   End
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      Alignment       =   1  'Right Justify
      BackColor       =   &H00000000&
      Caption         =   "20%"
      ForeColor       =   &H0000FFFF&
      Height          =   255
      Index           =   7
      Left            =   8280
      TabIndex        =   38
      Top             =   4800
      Width           =   735
   End
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      Alignment       =   1  'Right Justify
      BackColor       =   &H00000000&
      Caption         =   "999,999k"
      FontBold        =   -1  'True
      FontItalic      =   0   'False
      FontName        =   "Arial"
      FontSize        =   8.25
      FontStrikethru  =   0   'False
      FontUnderline   =   0   'False
      ForeColor       =   &H0000FFFF&
      Height          =   255
      Index           =   7
      Left            =   8280
      TabIndex        =   39
      Top             =   480
      Width           =   735
   End
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      Alignment       =   1  'Right Justify
      BackColor       =   &H00000000&
      Caption         =   "999,999k"
      FontBold        =   -1  'True
      FontItalic      =   0   'False
      FontName        =   "Arial"
      FontSize        =   8.25
      FontStrikethru  =   0   'False
      FontUnderline   =   0   'False
      ForeColor       =   &H0000FFFF&
      Height          =   255
      Index           =   6
      Left            =   7320
      TabIndex        =   35
      Top             =   480
      Width           =   735
   End
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      Alignment       =   1  'Right Justify
      BackColor       =   &H00000000&
      Caption         =   "999,999k"
      FontBold        =   -1  'True
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      FontName        =   "Arial"
      FontSize        =   8.25
      FontStrikethru  =   0   'False
      FontUnderline   =   0   'False
      ForeColor       =   &H0000FFFF&
      Height          =   255
      Index           =   5
      Left            =   6360
      TabIndex        =   34
      Top             =   480
      Width           =   735
   End
   Begin Label MaxValueLab 
      Alignment       =   1  'Right Justify
      BackColor       =   &H00000000&
      Caption         =   "999,999k"
      FontBold        =   -1  'True
      FontItalic      =   0   'False
      FontName        =   "Arial"
      FontSize        =   8.25
      FontStrikethru  =   0   'False
      FontUnderline   =   0   'False
      ForeColor       =   &H0000FFFF&
      Height          =   255
      Index           =   4
      Left            =   5400
      TabIndex        =   33
      Top             =   480
      Width           =   735
   End
   Begin Label MaxValueLab 
      Alignment       =   1  'Right Justify
      BackColor       =   &H00000000&
      Caption         =   "999,999k"
      FontBold        =   -1  'True
      FontItalic      =   0   'False
      FontName        =   "Arial"
      FontSize        =   8.25
      FontStrikethru  =   0   'False
      FontUnderline   =   0   'False
      ForeColor       =   &H0000FFFF&
      Height          =   255
      Index           =   3
      Left            =   4440
      TabIndex        =   32
      Top             =   480
      Width           =   735
   End
   Begin Label WarnLabel 
      Alignment       =   1  'Right Justify
      BackColor       =   &H00000000&
      Caption         =   "20%"
      ForeColor       =   &H0000FFFF&
      Height          =   255
      Index           =   6
      Left            =   7320
      TabIndex        =   28
      Top             =   4800
      Width           =   735
   End
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      Alignment       =   2  'Center
      BackColor       =   &H00000000&
      Caption         =   "Drive E:"
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      Height          =   255
      Index           =   6
      Left            =   7320
      TabIndex        =   27
      Top             =   120
      Width           =   735
   End
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      Alignment       =   1  'Right Justify
      BackColor       =   &H00000000&
      Caption         =   "0%"
      ForeColor       =   &H0000FFFF&
      Height          =   255
      Index           =   6
      Left            =   7320
      TabIndex        =   26
      Top             =   4440
      Width           =   735
   End
   Begin Label WarnLabel 
      Alignment       =   1  'Right Justify
      BackColor       =   &H00000000&
      Caption         =   "20%"
      ForeColor       =   &H0000FFFF&
      Height          =   255
      Index           =   5
      Left            =   6360
      TabIndex        =   25
      Top             =   4800
      Width           =   735
   End
   Begin Label HeadingLab 
      Alignment       =   2  'Center
      BackColor       =   &H00000000&
      Caption         =   "Drive D:"
      ForeColor       =   &H0000FFFF&
      Height          =   255
      Index           =   5
      Left            =   6360
      TabIndex        =   24
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      BackColor       =   &H00000000&
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      Index           =   5
      Left            =   6360
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   End
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      Alignment       =   1  'Right Justify
      BackColor       =   &H00000000&
      Caption         =   "20%"
      ForeColor       =   &H0000FFFF&
      Height          =   255
      Index           =   4
      Left            =   5400
      TabIndex        =   22
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      Width           =   735
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      BackColor       =   &H00000000&
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      Height          =   255
      Index           =   4
      Left            =   5400
      TabIndex        =   21
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      BackColor       =   &H00000000&
      Caption         =   "0%"
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      Index           =   4
      Left            =   5400
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      BackColor       =   &H00000000&
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      BackColor       =   &H00000000&
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      ForeColor       =   &H0000FFFF&
      Height          =   255
      Index           =   3
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      TabIndex        =   17
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   End
   Begin Label WarnLabel 
      Alignment       =   1  'Right Justify
      BackColor       =   &H00000000&
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      ForeColor       =   &H0000FFFF&
      Height          =   255
      Index           =   2
      Left            =   3480
      TabIndex        =   16
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      Width           =   735
   End
   Begin Label WarnLabel 
      Alignment       =   1  'Right Justify
      BackColor       =   &H00000000&
      Caption         =   "20%"
      ForeColor       =   &H0000FFFF&
      Height          =   255
      Index           =   1
      Left            =   2520
      TabIndex        =   15
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      Width           =   735
   End
   Begin Label WarnLabel 
      Alignment       =   1  'Right Justify
      BackColor       =   &H00000000&
      Caption         =   "20%"
      ForeColor       =   &H0000FFFF&
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      Index           =   0
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      BackColor       =   &H00000000&
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   End
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      Alignment       =   2  'Center
      BackColor       =   &H00000000&
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      ForeColor       =   &H0000FFFF&
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      TabIndex        =   12
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   End
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      BackColor       =   &H00000000&
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      ForeColor       =   &H0000FFFF&
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      Index           =   0
      Left            =   1560
      TabIndex        =   11
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      Alignment       =   1  'Right Justify
      BackColor       =   &H00000000&
      Caption         =   "0%"
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      Index           =   2
      Left            =   3480
      TabIndex        =   10
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   End
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      Alignment       =   1  'Right Justify
      BackColor       =   &H00000000&
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      BackColor       =   &H00000000&
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   Begin Menu mnu_Main 
      Caption         =   "&File"
      Index           =   0
      Begin Menu mnu_File 
         Caption         =   "E&xit"
         Index           =   0
      End
   End
   Begin Menu mnu_Main 
      Caption         =   "&Options"
      Index           =   1
      Begin Menu mnu_Options 
         Caption         =   "&Jiggle pointers"
         Checked         =   -1  'True
         HelpContextID   =   6
         Index           =   0
      End
      Begin Menu mnu_Options 
         Caption         =   "&Save Settings On Exit"
         Checked         =   -1  'True
         HelpContextID   =   7
         Index           =   1
      End
   End
   Begin Menu mnu_Main 
      Caption         =   "&Icon Display"
      Index           =   2
      Begin Menu mnu_Icon 
         Caption         =   "&System"
         HelpContextID   =   1
         Index           =   0
      End
      Begin Menu mnu_Icon 
         Caption         =   "&GDI"
         HelpContextID   =   1
         Index           =   1
      End
      Begin Menu mnu_Icon 
         Caption         =   "&User"
         HelpContextID   =   1
         Index           =   2
      End
      Begin Menu mnu_Icon 
         Caption         =   "&Memory"
         HelpContextID   =   2
         Index           =   3
      End
   End
   Begin Menu mnu_Main 
      Caption         =   "&Help"
      Index           =   4
      Begin Menu mnu_Help 
         Caption         =   "&Contents"
         Index           =   0
      End
      Begin Menu mnu_Help 
         Caption         =   "&Search for Help On..."
         Index           =   1
      End
      Begin Menu mnu_Help 
         Caption         =   "&How to Use Help"
         Index           =   2
      End
      Begin Menu mnu_Help 
         Caption         =   "-"
         Index           =   3
      End
      Begin Menu mnu_Help 
         Caption         =   "&About Montor..."
         Index           =   4
      End
   End
End
Option Explicit
Dim TopAdj%         ' distance of 100% mark from top of gauge
Dim GHeight!        ' height of gauge - used in several routines
Dim WhichIcon%      ' Tells which resource to show when iconic
Dim LineL%, LineR%  ' Range of a click on gauge line

Sub ChangeWarn (ByVal Index%, ByVal Change%)
  '  Move a warning level pointer up or down by specified percent
  WarnLevPtr(Index).Tag = WarnLevPtr(Index).Tag + Change
  If WarnLevPtr(Index).Tag > 100 Then WarnLevPtr(Index).Tag = 100
  If WarnLevPtr(Index).Tag < 0 Then WarnLevPtr(Index).Tag = 0
  ' Place the pointer and adjust the labels
  PlaceWarnPtr Index
End Sub

Sub Form_Load ()
  ' If a previous instance is running, activate it instead
  Dim SaveTitle As String * 40
  If App.PrevInstance Then
    SaveTitle$ = App.Title
    App.Title = "... duplicate instance."
    Form1.Caption = "... duplicate instance."
    AppActivate SaveTitle$
    SendKeys "% R", True
    End
  End If

  ' Initialize two variables used in calculating pointer positions.
  ' Gauge line starts and ends 7 pixels from top/bottom of bitmap.
  TopAdj = 7 * Screen.TwipsPerPixelY
  GHeight = 200 * Screen.TwipsPerPixelY
  
  ' Include gauges for up to four fixed disks.  Use GetDriveType to
  ' check each possible drive letter - only monitor those whose type
  ' is DRIVE_FIXED
  ActualGauges = 4
  Dim N%, Disk As String * 2
  N = 0
  Do While (N < 26) And (ActualGauges < NumGauges)
    If GetDriveType(N) = DRIVE_FIXED Then
      GaugeMain(ActualGauges).TabStop = True
      Disk = Chr$(N + 65) + ":"
      HeadingLab(ActualGauges).Caption = "Drive " + Disk
      ' Tag for HeadingLab is disk NUMBER for disk size functions
      HeadingLab(ActualGauges).Tag = N + 1
      Load Form1.mnu_Icon(ActualGauges)
      Form1.mnu_Icon(ActualGauges).Caption = "Drive &" + Disk
      Form1.mnu_Icon(ActualGauges).Visible = True
      Form1.mnu_Icon(ActualGauges).HelpContextID = 3
      ActualGauges = ActualGauges + 1
    End If
    N = N + 1
  Loop
  ' Shrink the form to chop off any unused drive gauges
  Width = GaugeMain(ActualGauges - 1).Left
  Width = Width + GaugeMain(ActualGauges - 1).Width
  Width = Width + (16 * Screen.TwipsPerPixelX)

  LoadFromIni
  Randomize

  ' To save EXE size, we store each picture ONCE in the EXE and
  ' copy it to the other elements of the same control array.
  Dim X%
  X = GaugeMain(0).Width - WarnLevPtr(0).Width
  For N = 0 To ActualGauges - 1
    CurrValPtr(N).Picture = CurrValPtr(0).Picture
    WarnLevPtr(N).Picture = WarnLevPtr(0).Picture
    WarnLevPtr(N).DragIcon = WarnLevPtr(0).DragIcon
    GaugeMain(N).Picture = GaugeMain(0).Picture
    PlaceWarnPtr N
  Next N

  ' Get the total system memory
  Dim mmi As tagMemManInfo
  mmi.Size = MMIsize
  Dim Success%
  Success = MemManInfo(mmi)
  GaugeMain(3).Tag = mmi.TotalPages + mmi.SwapFilePages
  GaugeMain(3).Tag = GaugeMain(3).Tag * mmi.PageSize
  MaxValueLab(3).Caption = MegaOrKilo(GaugeMain(3).Tag)

  ' Get the size of each fixed drive
  For N = 4 To ActualGauges - 1
    GaugeMain(N).Tag = GetDiskSize(HeadingLab(N).Tag)
    MaxValueLab(N).Caption = MegaOrKilo(GaugeMain(N).Tag)
  Next N

  ' Set left and right boundaries of the area on each gauge that will
  ' be accepted as a click ON the gauge's vertical line.
  LineL = GaugeMain(0).Width \ 2 - 60
  LineR = LineL + 120
End Sub

Sub Form_QueryUnload (Cancel As Integer, UnloadMode As Integer)
  SaveToIni
  Cancel = 0
End Sub

Sub Form_Resize ()
  ' If iconic, indicate which resource is being displayed
  If WindowState = 1 Then
    Caption = "Monitor " + HeadingLab(WhichIcon).Caption
  Else
    Caption = "System Monitor"
  End If
End Sub

Sub GaugeMain_DragDrop (Index As Integer, Source As Control, X As Single, Y As Single)
  ' Don't allow dropping onto a different gauge!
  If Source.Index <> Index Then Exit Sub
  ' Adjust position to stay within 0-100%
  If Y > TopAdj + GHeight Then Y = TopAdj + GHeight
  If Y < TopAdj Then Y = TopAdj
  ' Calculate new percent based on new position
  Source.Tag = (TopAdj + GHeight - Y) * 100 \ GHeight
  ' Place the pointer and adjust the labels
  PlaceWarnPtr Index
End Sub

Sub GaugeMain_GotFocus (Index As Integer)
  ' Indicate the selected gauge by highlighting its warn label
  WarnLabel(Index).BackColor = &H808080
End Sub

Sub GaugeMain_KeyUp (Index As Integer, KeyCode As Integer, Shift As Integer)
  ' When it receives an up or downarrow, the Picture Box tweaks
  ' the warning level up or down by one percent.  When
  ' it receives PgUp or PgDn, it tweaks the level by five percent
  Select Case KeyCode
    Case KEY_UP
      ChangeWarn ActiveControl.Index, 1
    Case KEY_DOWN
      ChangeWarn ActiveControl.Index, -1
    Case KEY_PRIOR ' PgUp
      ChangeWarn ActiveControl.Index, 5
    Case KEY_NEXT ' PgDn
      ChangeWarn ActiveControl.Index, -5
  End Select
End Sub

Sub GaugeMain_LostFocus (Index As Integer)
  ' Indicate the unselected gauge by unhighlighting its warn label
  WarnLabel(Index).BackColor = 0
End Sub

Sub GaugeMain_MouseUp (Index As Integer, Button As Integer, Shift As Integer, X As Single, Y As Single)
  ' If the user clicked on the line in the middle of the gauge...
  If (X >= LineL) And (X <= LineR) Then
    ' If they clicked above warning pointer, raise it, else lower it
    Dim Locat!
    Locat = (TopAdj + GHeight - Y) * 100 \ GHeight
    If Locat > WarnLevPtr(Index).Tag Then
      ChangeWarn Index, 1
    Else
      ChangeWarn Index, -1
    End If
  End If
End Sub

Sub HeadingLab_Click (Index As Integer)
  ' Click on label at gauge top to display that resource when iconic.
  SelectIconReport (Index)
End Sub

Sub LoadFromIni ()
  ' Load program options from MONTOR.INI
  mnu_Options(0).Checked = GetPrivateProfileInt("Options", "Jiggle Pointers", True, "MONTOR.INI")
  mnu_Options(1).Checked = GetPrivateProfileInt("Options", "Save Settings", True, "MONTOR.INI")
  Dim IconRpt%
  IconRpt = GetPrivateProfileInt("Icon Display", "Icon", 0, "MONTOR.INI")
  SelectIconReport (IconRpt)
  ' Get warning level for each gauge, or default of 20%
  Dim N%
  For N = 0 To ActualGauges - 1
    WarnLevPtr(N).Tag = GetPrivateProfileInt("Warning Levels", "Gauge" + Str$(N), 20, "MONTOR.INI")
  Next N
End Sub

Function MegaOrKilo$ (ByVal Amount&)
  ' Display below 1 million kilobytes as k, greater as M
  Const Kilo% = &H400
  Const Mega& = &H100000
  If Amount >= 1000000 * Kilo Then
    MegaOrKilo = Format$(Amount \ Mega, "###,###,###") + "M"
  Else
    MegaOrKilo = Format$(Amount \ Kilo, "###,###") + "k"
  End If
End Function

Sub mnu_File_Click (Index As Integer)
  ' Note that form2 (About box) and form3 (warning dialog)
  ' are unloaded after each use.
  Unload Form1
End Sub

Sub mnu_Help_Click (Index As Integer)
  ' WinHelp and WinHelpByNum are declared in MONTOR.BAS.  VB programs
  ' have automatic context-sensitive help, but they need these API
  ' functions for menu-selected help.
  Dim Success%
  Select Case Index
    Case 0
      Success = WinHelpByNum(Form1.hWnd, App.HelpFile, HELP_CONTENTS, 0)
    Case 1
      Success = WinHelp(Form1.hWnd, App.HelpFile, HELP_PARTIALKEY, "")
    Case 2
      Success = WinHelpByNum(Form1.hWnd, App.HelpFile, HELP_HELPONHELP, 0)
    Case 4
      Form2.Show MODAL
      Unload Form2
  End Select
End Sub

Sub mnu_Icon_Click (Index As Integer)
  ' Select name from icon menu to display that resource when iconic.
  SelectIconReport (Index)
End Sub

Sub mnu_Options_Click (Index As Integer)
  ' Information about whether the two Options menu items are checked
  ' is simply stored in Checked property of the menu items.
  mnu_Options(Index).Checked = Not mnu_Options(Index).Checked
End Sub

Sub PlaceWarnPtr (ByVal Index%)
  ' The warning level pointer's tag contains the new percent - now
  ' adjust the labels and place the pointer to match that percent.
  ' Adjust the Warn At caption
  WarnLabel(Index).Caption = Str$(WarnLevPtr(Index).Tag) + "%"
  ' The gauge is exactly 200 pixels high
  Dim NewY%
  ' Set NewY to the *pixel* height corresponding to the percentage
  NewY = ((98 - WarnLevPtr(Index).Tag) * 2) - 1
  ' Convert NewY to twips (VB's unit of screen measurement)
  NewY = NewY * Screen.TwipsPerPixelY
  ' Adjust to start at the top of the gauge line
  NewY = NewY + TopAdj
  WarnLevPtr(Index).Move WarnLevPtr(Index).Left, NewY
  WarnLabel(Index).Tag = False
End Sub

Sub SaveToIni ()
  ' Write Save Settings option to MONTOR.INI; write the rest of the
  ' options only if Save Settings is TRUE
  Dim Success%
  Success% = WritePrivateProfileString("Options", "Save Settings", mnu_Options(1).Checked, "MONTOR.INI")
  If mnu_Options(1).Checked Then
    Success% = WritePrivateProfileString("Options", "Jiggle Pointers", mnu_Options(0).Checked, "MONTOR.INI")
    Success% = WritePrivateProfileString("Icon Display", "Icon", Str$(WhichIcon), "MONTOR.INI")
    Dim N%
    For N = 0 To ActualGauges - 1
      Success% = WritePrivateProfileString("Warning Levels", "Gauge" + Str$(N), WarnLevPtr(N).Tag, "MONTOR.INI")
    Next N
  End If
End Sub

Sub SelectIconReport (ByVal Index%)
  ' Un-check old selected item & set its label's background to black
  mnu_Icon(WhichIcon).Checked = False
  HeadingLab(WhichIcon).BackColor = 0
  ' Check new selected item & set its label's background to gray
  mnu_Icon(Index).Checked = True
  HeadingLab(Index).BackColor = &H808080
  WhichIcon = Index
End Sub

Sub Timer1_Timer ()
  ' This method is called about every two seconds - it updates all of
  ' the gauges and warns if any have dropped below the minimum.  If
  ' MONTOR is iconic, it draws the icon.

  ' Set current values for the system resource gauges
  Dim shi As TagSysHeapInfo
  shi.Size = SHIsize
  Dim Success%
  Success = SystemHeapInfo(shi)
  CurrValPtr(2).Tag = shi.UserFreePercent
  CurrValPtr(1).Tag = shi.GDIFreePercent
  If shi.UserFreePercent < shi.GDIFreePercent Then
    CurrValPtr(0).Tag = shi.UserFreePercent
  Else
    CurrValPtr(0).Tag = shi.GDIFreePercent
  End If
  
  ' Set and display current value for the memory gauge
  CurrValPtr(3).Tag = GetFreeSpace(0)
  CurrValLab(3).Caption = MegaOrKilo(CurrValPtr(3).Tag)
  ' Set and display current value for disk space gauges
  Dim N%
  For N = 4 To ActualGauges - 1
    CurrValPtr(N).Tag = GetDiskFree(HeadingLab(N).Tag)
    CurrValLab(N).Caption = MegaOrKilo(CurrValPtr(N).Tag)
  Next N

  ' Redisplay the pointers
  Dim Locat!, Percent!
  Dim NewCVY%
  For N = 0 To ActualGauges - 1
    ' Calculate the current percentage
    NewCVY = (100 * CurrValPtr(N).Tag) / GaugeMain(N).Tag
    PercentLab(N).Caption = Str$(NewCVY) + "%"
    NewCVY = ((98 - NewCVY) * 2) - 1
    NewCVY = NewCVY * Screen.TwipsPerPixelY
    NewCVY = NewCVY + TopAdj
    CurrValPtr(N).Move 0, NewCVY
  Next N

  ' If the "Jiggle Pointers" option is checked...
  If mnu_Options(0).Checked Then
    ' Blink the "pulse" circles
    Dim TempCol&
    TempCol = Circ(0).BackColor
    Circ(0).BackColor = Circ(1).BackColor
    Circ(1).BackColor = TempCol
    ' Jiggle the pointers
    Dim NewY%
    For N = 0 To ActualGauges - 1
      Select Case Rnd
        Case 0 To .2
          NewY = CurrValPtr(N).Top + Screen.TwipsPerPixelY
          CurrValPtr(N).Move CurrValPtr(N).Left, NewY
        Case .2 To .4
          NewY = CurrValPtr(N).Top - Screen.TwipsPerPixelY
          CurrValPtr(N).Move CurrValPtr(N).Left, NewY
      End Select
    Next N
  End If

  ' Check if any warnings are necessary
  For N = 0 To ActualGauges - 1
    Percent = (CurrValPtr(N).Tag * 100) / GaugeMain(N).Tag
    If Percent < WarnLevPtr(N).Tag Then
      If Not WarnLabel(N).Tag Then
        Select Case N
          Case 0 To 2
            ' Normally you would assign WnTx's value using one long
            ' program line.  Here it's built up gradually, so as to
            ' make it easier to publish the source code.
            WnTx = "Free " + HeadingLab(N).Caption + " resources have"
            WnTx = WnTx + " dropped below" + Str$(WarnLevPtr(N).Tag)
            WnTx = WnTx + "%." + Chr$(13) + Chr$(13) + "Even if you "
            WnTx = WnTx + "have plenty of memory free, you will not "
            WnTx = WnTx + "be able to run many more programs. "
            WnTx = WnTx + "Consider closing one or more programs."
            WarnHelp = 1
          Case 3
            WnTx = "Free memory has dropped below"
            WnTx = WnTx + Str$(WarnLevPtr(N).Tag) + "%." + Chr$(13)
            WnTx = WnTx + Chr$(13) + "Consider closing one or more "
            WnTx = WnTx + "programs."
            WarnHelp = 2
          Case 4 To ActualGauges
            WnTx = "Free disk space on " + HeadingLab(N) + " has "
            WnTx = WnTx + "dropped below" + Str$(WarnLevPtr(N).Tag)
            WnTx = WnTx + "%." + Chr$(13) + Chr$(13) + "Consider "
            WnTx = WnTx + "using File Manager to delete any files "
            WnTx = WnTx + "that are no longer needed."
            WarnHelp = 3
        End Select
        MessageBeep MB_ICONSTOP
        Form3.Show MODAL
        Unload Form3
        WarnLabel(N).Tag = True
      End If
    Else
      WarnLabel(N).Tag = False
    End If
  Next N

  ' If MONTOR is iconic, draw the icon
  If WindowState = 1 Then
    ' fill whole area with black
    Line (0, 0)-(ScaleWidth, ScaleHeight), 0, BF
    ' draw gauge-line near right side
    Line (ScaleWidth - 60, 0)-(ScaleWidth - 60, ScaleHeight)
    ' set location for writing percent value
    CurrentX = 2 * Screen.TwipsPerPixelX
    Percent = (CurrValPtr(WhichIcon).Tag) / GaugeMain(WhichIcon).Tag
    ' Set Y position to avoid printing on light/dark boundary
    If Percent < .5 Then
      CurrentY = Screen.TwipsPerPixelY
    Else
      CurrentY = ScaleHeight \ 2
    End If
    Print PercentLab(WhichIcon).Caption
    ' XOR the portion corresponding to free percentage
    DrawMode = 7
    Dim Y!
    Y = (1 - Percent) * (ScaleHeight)' - (2 * TopAdj))
    Line (0, Y)-(ScaleWidth, ScaleHeight), &HFFFFFF, BF
    DrawMode = 13
  End If
End Sub

Sub WarnLabel_Click (Index As Integer)
  GaugeMain(Index).SetFocus
End Sub