INT 16 - PCIBM PC Tools v5.1+ BACKTALK - INSTALLATION CHECK AX = 6969h BX = 6969h DX = 0000h Return: DX nonzero if installed BX = CS of resident code DX = PSPsee Program Segment Prefix segment of resident code DS:SI -> ASCIZA NUL-terminated ASCII string. The ASCIZ string "ABC" consists of the four bytes 41h, 42h, 43h, and 00h. Unless otherwise specified, maximum lengths given in the interrupt list do not include the terminating NUL. identification string "CPoint Talk"