Int 21 Fn FFC3  - Topware Network Os V5.10+ - Get Sharing Status Of Print  [N]

   AX = FFC3h

Return: AL = sharing status of printers (see #2225)
       FFh if not a printer server

Bitfields for TopWare printer sharing status:
Bit(s) Description (Table 2225)
 2 LPT3 is shared
 1 LPT2 is shared
 0 LPT1 is shared