INT 15 C - OS HOOK - SysReq KEY ACTIVITY (ATIBM PC AT,PSIBM PS/2, any model) AH = 85h AL = SysReq key action (00h pressed, 01h released) CF clear Return: CF clear if successful AH = 00h CF set on error AH = status (see #00496) Notes: called by keyboard decode routine the default handler simply returns successfully; programs which wish to monitor the SysReq key must hook this call the SysReq key is often labeled SysRq SeeAlso: INT 09