Int 21 Fn F21B  - Novell Netware - Lock Physical Record Set (old)          [N]

   AX = F21Bh
   CX = length of request packet in bytes
   DX = 0000h (no reply packet)
   DS:SI -> request packet (see #2168 at AX=F26Eh)
   ES:DI ignored

Return: AX = status (see #2546 at INT 2F/AX=7A20h/BX=0000h)

See Also: AH=F2h"Novell",AX=F26Eh,AH=C2h"NetWare"