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DWHOST.DOC
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1993-08-30
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DWHost v3.0
(c) Copyright 1986 - 1992 by J.C. Kilday Associates
Developed at the Northern Lights BBS
207-761-4782 (v.32bis/VHST)
Table of Contents
-----------------
Introduction .................... 1
Description ..................... 1
Advanced Answering Modes ........ 2
Installation .................... 3
Additional Setup Notes .......... 4
Operating DW Host ............... 6
Advanced Features ............... 7
Support ......................... 8
DW Host v3.0 Page 1
Introduction
------------
DW Host is a specialized host communications program primarily
intended to support operations at the DOS level on the host. It may
be interfaced with other communications packages to implement more
complex functions. It is intended for operation with Doorway (which
allows nearly any non-graphics program to be run from remote). File
transfer operations are supported directly from DOS by DWXFER as is
mentioned in the next section. Popular applications of DW Host
include home-to-office (and vice versa) communications as well as
operations between a company home office and its remote sites.
Software configuration and file maintenance on the DW Host-equipped
host are frequent uses. DW Host is designed for operation on an IBM
PC, XT, AT, PS/2 or a close compatible connected to a Hayes-compatible
modem or a US Robotics HST.
The complete DW Host package includes the following files:
DWHost.DOC - this file
DWHost.COM - executable module
DWHost.OVR - DW Host "overlay" file
CONFIG.HLP - context-sensitive help file
HOST.BAT - optional controlling batch file
DO_DW.BAT - batch file executed by DW Host
READ.ME - quick review information
Description
-----------
DW Host normally monitors the modem and upon detecting a ring answers
the call while adjusting to the caller's baud rate. Speeds of 38,400
bps down to 300 bps are supported with the following comm parameters:
8 data bits, no parity, 1 stop bit. Upon successful connect, DW Host
greets the caller with a one-line message of your choosing and requests
entry of a password, also of your choosing. If the correct password is
supplied and the callback mode is not in effect, DW Host will transfer
control of the next part of the communications session to other
software. Depending on the configuration option chosen, the caller may
be dropped to the DOS level (with a DOORWAY command line having been
invoked to support continued communications). Or a caller may next see
another communications application, such as a BBS-like package, or a
menu of programs that might be run (using the Doorway munu capability).
If the correct password is not given to DW Host in three attempts,
DW Host hangs up and recycles.
For enhanced security against unauthorized access the callback feature
is available. If the callback mode is in effect when the correct
password is given, rather than give the caller immediate access, the
program disconnects the caller and dials the telephone number
specified in the configuration data. Access is granted only if there
is a successful connect at that number. DW Host makes up to 3
attempts to establish a connect (it calls a 2nd and 3rd time at
intervals of 1 minute if no answer, a busy signal, or no modem
connect). If no connection is made on the 3rd attempt, the program
DW Host Page 2
recycles and sets up to await another call.
If access is granted to the DOS level on the host machine (through
DOORWAY), virtually all DOS commands may be executed and so may most
other programs which do not use bit mapped graphics. A program called
DWXFER supports file transfers while in DOS. It is included in this
ZIP. You might also like to try Chuck Forsberg's DSZ for Zmodem file
transfers, rather than the older protocol provided by DWXFER (although
DWXFER is simpler to use).
A log of call activity (a file called DW.LOG) is created by DW Host so
that any attempts of unauthorized access to your system may be noted.
Calls accepted (and normal logoffs), rejected calls (password
failures), and other connects not resulting in access to the system
(hang ups at the password prompt and 3-minute timeouts awaiting
password entry) are all recorded in this text file. The file includes
the date and time of each call and how each ended. It can be viewed
using the the DOS TYPE command. It may be deleted at any time (using
DOS ERASE or DEL) and the program will start a new one whenever the
next entry is to be made.
When DW Host is awaiting a call, a display including the date and
time, some key setup information, and present DW Host status is shown.
A screen blanker turns off the screen if there is no keyboard activity
within a 2-minute span. Striking any key restores the display. The
display also is toggled on and off by hitting F9. F10 presents
information about the program. F3 allows access to the configuration
screen where various DW Host setup options may be specified. F1 or F2
cause DW Host to terminate. F1 leaves the telephone line in a BUSY
state (modem offhook) while F2 leaves the modem onhook.
Advanced Answering Modes
------------------------
DW Host normally is set up to answer a call on the first ring. But
where there is need for the host computer to share a phone line and
not intrude on voice calls, special answering modes may be configured.
"Long Ring" may be configured such that DW Host answers only after the
specified number of rings have been received. Alternatively, "Ring
Back" may be chosen. This mode requires a caller to dial twice before
DW Host answers. The first call consists of a specified number of
rings (or DW Host can be configured for a non-specific number of rings
on the first call). DW Host answers a second call if received within
one minute of the first that lasted the proscribed number of rings.
Still another answering mode, Triggered Callback, may be specified
where DW Host never answers but, instead, places a call to the number
with which it had been configured. Almost a combination of callback
and Ring Back, Triggered Callback is set up by two calls much the same
as Ring Back. The first call must be of a specified number of rings
(or a non-specific number) and a second call must be received within
DW Host v3.0 Page 3
Advanced Answering Modes (Continued)
------------------------------------
one minute of the first. If so "triggered", DW Host goes offhook and
dials out. Upon connecting to the called computer, a password is
required before the called party is allowed access. Just as in the
callback process described earlier, 3 attempts at a successful connect
are made.
Installation
------------
DW Host is designed to operate under DOS 3.0, an