INT 21 - LANtastic - GET ACTIVE USER INFORMATION                                
	AX = 5FB0h
	BX = server login entry index
	DS:SI -> buffer for active user entry (see #01739)
	ES:DI -> ASCIZA NUL-terminated ASCII string.	The ASCIZ string "ABC" consists of the four bytes 41h, 42h, 43h, and 00h.  Unless otherwise specified, maximum lengths given in the interrupt list do not include the terminating NUL. machine name in form "\\server"
Return: CF clear if successful
	CF set on error
	    AX = error code
	BX = next login index
SeeAlso: AX=5FB2h


Format of LANtastic active user entry:
Offset	Size	Description	(Table 01739)
 00h	WORD	virtual circuit number
 02h	BYTE	login state (see #01740)
 03h	BYTE	last command issued (see #01741)
 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(s)	Description	(Table 01740)
 0	fully logged in
 1	remote program load login
 2	user has system manager privileges
 3	user can create audit entries
 4	bypass mail protection
 5	treat as local process
 6	bypass queue protection
 7	bypass access control lists


(Table 01741)
Values for last LANtastic 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)