INT 21 - LANtastic v3+ - GET ACCOUNT                                            
	AX = 5F87h
	DS:SI -> 128-byte buffer for account information (see #01728)
	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 "\\machine"
Return: CF clear if successful
	CF set on error
	    AX = error code
	BX destroyed
Note:	must be logged into the specified machine


Format of LANtastic user account structure:
Offset	Size	Description	(Table 01728)
 00h 16 BYTEs	blank-padded username (zero-padded for v4.x)
 10h 16 BYTEs	reserved (00h)
 20h 32 BYTEs	user description
 40h	BYTE	privilege bits (see #01729)
 41h	BYTE	maximum concurrent users
 42h 42 BYTEs	bit map for disallowed half hours, beginning on Sunday
		(bit set if half-hour not an allowed time)
 6Ch	WORD	internal (0002h)
 6Eh  2 WORDs	last login time
 72h  2 WORDs	account expiration date (MS-DOS-format year/month:day)
 76h  2 WORDs	password expiration date (0 = none)
 7Ah	BYTE	number of days to extend password after change (1-31)
		00h if no extension required
---v3.x---
 7Bh  5 BYTEs	reserved
---v4.x---
 7Bh	BYTE	storage for first letter of user name when deleted (first
		  character is changed to 00h when deleting account)
 7Ch	BYTE	extended privileges
 7Dh  3 BYTEs	reserved


Bitfields for LANtastic privilege bits:
Bit(s)	Description	(Table 01729)
 7	bypass access control lists
 6	bypass queue protection
 5	treat as local process
 4	bypass mail protection
 3	allow audit entry creation
 2	system manager
 0	user cannot change password