Int 21 Fn C504  - Novell Netware - Synchronization Services - Close Semap  [N]

   AX = C504h
   CX:DX = semaphore handle

Return: AL = status
       00h successful
       FFh invalid handle
Desc:  decrement the semaphore's open count, and delete the semaphore if the
     count reaches zero

Note:  this function is supported by NetWare 4.6+, Advanced NetWare 1.0+, and
     Alloy NTNX

See Also: AX=C500h"NetWare",AX=C501h