INT 21 - Novell NetWare - TRANSACTION TRACKING SYSTEM - BEGIN TRANSACTION
        AX = C700h
Return: CF clear if successful
            AL = 00h
        CF set on error
            AL = error code
                96h out of memory
                FEh implicit transaction already active, converted to explicit
                FFh explicit transaction already active
Note:   this function is supported by NetWare 4.0+ and Advanced NetWare 1.0+
SeeAlso: AX=C702h,AX=C703h