INT 15 - DOS 3.0+ PRINT.COM - SET CRITICAL REGION FLAG AX = 2001h ES:BX -> byte which is to be incremented while in a DOS call Return: nothing Desc: specify a user flag which PRINT should set to let an interested application know it is in a critical region Note: also supported by PC Network v1.00 RECEIVER.COM SeeAlso: AX=2000h