INT 21 - Novell NetWare - SYNCHRONIZATION SERVICES - EXAMINE SEMAPHORE
AX = C501h
CX:DX = semaphore handle
Return: AL = status
00h successful
CX = semaphore value (-127 to 127)
DL = count of processes which have the semaphore open
FFh invalid handle
Note:   this function is supported by NetWare 4.6+, Advanced NetWare 1.0+, and
Alloy NTNX
SeeAlso: AX=C502h,AX=C504h

See also: 21C500

21C501 - Novell NetWare - SYNCHRONIZATION SERVICES - EXAMINE SEMAPHORE