Int 21 Fn 5FB0  - LANtastic - Get Active User Information                  [N]

   AX = 5FB0h
   BX = server login entry index
   DS:SI -> buffer for active user entry (see below)
   ES:DI -> ASCIZ machine name in form "\\server"

Return: CF clear if successful
   CF set on error
       AX = error code
   BX = next login index

See Also: AX=5FB2h

Format of active user entry:
Offset Size    Description
 00h   WORD    virtual circuit number
 02h   BYTE    login state (see below)
 03h   BYTE    last command issued (see below)
 04h  5 BYTEs  number of I/O bytes (40-bit unsigned number)
 09h  3 BYTEs  number of server requests (24-bit unsigned)
 0Ch 16 BYTEs  name of user who is logged in
 1Ch 16 BYTEs  name of remote logged in machine
 2Ch   BYTE    extended privileges (v4+???)
       bit 0: user cannot change his password
 2Dh   WORD    time left in minutes (0000h = unlimited) (v4+???)

Bitfields for login state:
 bit 0 fully logged in
 bit 1 remote program load login
 bit 2 user has system manager privileges
 bit 3 user can create audit entries
 bit 4 bypass mail protection
 bit 5 treat as local process
 bit 6 bypass queue protection
 bit 7 bypass access control lists

Values for last command:
 00h   login
 01h   process termination
 02h   open file
 03h   close file
 04h   create file
 05h   create new file
 06h   create unique file
 07h   commit data to disk
 08h   read file
 09h   write file
 0Ah   delete file
 0Bh   set file attributes
 0Ch   lock byte range
 0Dh   unlock byte range
 0Eh   create subdirectory
 0Fh   remove subdirectory
 10h   rename file
 11h   find first matching file
 12h   find next matching file
 13h   get disk free space
 14h   get a queue entry
 15h   set a queue entry
 16h   control the queue
 17h   return login information
 18h   return link description
 19h   seek on file
 1Ah   get server's time
 1Bh   create audit entry
 1Ch   open file in multitude of modes
 1Dh   change password
 1Eh   disable account
 1Fh   local server file copy
---v3+---
 20h   get username from account file
 21h   translate server's logical path
 22h   make indirect file
 23h   get indirect file contents
 24h   get physical printer status
 25h   get logical print stream info
 26h   set logical print stream info
 27h   get user's account record
---v4+---
 28h   request server shutdown
 29h   cancel server shutdown
 2Ah   stuff server's keyboard
 2Bh   write then commit data to disk
 2Ch   set extended queue entry
 2Dh   terminate user from server
 2Eh   enable/disable logins
 2Fh   flush server caches
 30h   change username
 31h   get extended queue entry
   (same as get queue, but can return named fields blanked)