INT 21 - Novell NetWare - SYNCHRONIZATION SERVICES - CLOSE SEMAPHORE
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
SeeAlso: AX=C501h

See also: 21C500

21C504 - Novell NetWare - SYNCHRONIZATION SERVICES - CLOSE SEMAPHORE