actually.. that said, a program called VNC that is used to operate a computer remotely, over a network, has a menu option "Send CTRL ALT DEL" which causes the remote machine to display the options box. i think they may have used a low level keyboard hook of some kind though..
did a bit of research and it seems that ctrl+alt+delete is actually a special combination that, though some specific wiring in the keyboard, causes an interrupt to be generated on the cpu with a specific code. windows handles this interrupt and shows the security screen. how you would emulate this interrupt yourself, i do not know. might be good if you told us WHY you want to do this
Although it doesn't work for me it seems that there is a way to trigger the "Windows Security" box. Have a look at http://www.codeproject.com/system/al...rol_delete.asp. (it's in VC++)
If you just want to call the Task Manager than it's simple 'cause you can use Shell to execute taskmgr.exe from windows\system32.
You liked it? Please show your gratitude and rate it!