Category: resident utilities
INT 21 - ENVLOCK - INSTALLATION CHECK AX = 6262h SI = 1994h Return: AX = 1994h if installed ES = ENVLOCK's resident segment Notes: to deactivate ENVLOCK, zero out the byte at ES:[0102h] Program: ENVLOCK is a TSR by Alexander Yanovsky that forces other TSRs to deallocate their environment when they stay resident