INT 2F - KS/KEYSTKCT.EXE - INSTALLATION CHECK AX = FD12h Return: AX = 0093h if installed ES = resident code segment ES:CX -> internal "putbuf" routine Program: KS/KEYSTKCT.EXE is a key stacking utility (4DOS KEYSTACK.SYS look-alike) by Martin Gerdes, published in c't 11/1991, which can be loaded as a device driver or as a TSR. It does not emulate 4DOS KSTACK API Note: the default buffer size is 128 keys