INT 2F - PRINDIR v9.0 - SET LOCK FILENAME AX = 7F04h CX:DX -> ASCIZ name of lock file Return: AX = status 0000h successful FFFFh invalid device number SeeAlso: AX=7F00h"PRINDIR",AX=7F01h"PRINDIR",AX=7F03h"PRINDIR" SeeAlso: AX=7F05h,AX=7F06h,AX=7F08h,AX=7F0Ah,AX=7F0Bh