Int 21 Fn FFCD  - Topware Network OS V5.10+ - Get Status Of All Print Ser  [N]

   AX = FFCDh
   DS:DX -> buffer for server status (see below)

Return: AL = status
       00h successful
       AH = number of print servers
       nonzero failed

Format of server status:
Offset Size    Description
 00h   BYTE    station address
 01h 15 BYTEs  username
 10h   BYTE    flag: 01h printer is shared, 00h sharing disabled
 11h   BYTE    number of files pending in queue