Int 21 Fn BC  - Novell Netware - Synchronization Services - Log Physical   [N]

   AH = BCh
   AL = flags (see #1496)
   BX = file handle
   CX:DX = starting offset in file
   SI:DI = length of region to lock
   BP = timeout in timer ticks (1/18 sec)
       0000h = don't wait if already locked

Return: AL = status (see #1495)
Desc:  add the specified physical record to the log table, optionally locking
     it

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

See Also: AH=5Ch,AH=BDh,AH=BEh,AH=BFh,AH=C2h,AH=D0h

(Table 1495)
Values for NetWare status:
 00h   successful
 96h   no dynamic memory for file
 FEh   timed out
 FFh   failed

Bitfields for NetWare flags:
Bit(s) Description (Table 1496)
 0 lock as well as log record
 1 non-exclusive lock