Originally Posted by cjard
when those keys are pressed, the keyboard doesnt send the ascii code for a Ctrl, the ascii code for an Alt and the ascii Ctrl for a delete through to the higher level functions of the os.. it actually causes an IRQ interrupt on one of the interrupt lines on the motherboard, just like a PCI device does when it wants attention.
Windows is programmed to respond to that interrupt, but because interrupt lines are physical electrical wires that a voltage appears on, you cant make software do this; software cannot generate voltage in a switched circuit that is not accessible by a software-controlled voltage device..