Int 21 Fn 5FA7  - LANtastic - Create User Audit Entry                      [N]

   AX = 5FA7h
   DS:DX -> ASCIZ reason code (max 8 bytes)
   DS:SI -> ASCIZ variable reason string (max 128 bytes)
   ES:DI -> ASCIZ machine name in form "\\machine"

Return: CF clear if successful
   CF set on error
       AX = error code

Note:  you must be logged in to the specified server and have the "U"
     privilege to execute this call