Int 21 Fn CB  - Novell Netware - Synchronization Services - Lock File Set  [N]

   AH = CBh
   if function C6h lock mode 00h:
       DL = mode
       00h no wait
       01h wait
   if function C6h lock mode 01h:
       BP = lock timeout in timer ticks (1/18 sec) 0000h = no wait

Return: AL = status
       00h successful
       FEh timed out
       FFh failed
Desc:  attempt to lock all files listed in the log table

Notes: this function is supported by NetWare 4.0+, Advanced NetWare 1.0+, and
     Alloy NTNX
   status FFh will be returned if one or more of the files have already
     been exclusively locked by another process

See Also: AH=CAh,AH=CDh,AH=D1h,AH=EBh