Int 21 Fn 5F87  - Lantastic V3+ - Get Account                              [N]

   AX = 5F87h
   DS:SI -> 128-byte buffer for account information (see #1417)
   ES:DI -> ASCIZ 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 1417)
 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 #1418)
 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 1418)
 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