When using windows, how do I press CRTL ALT DEL ?

You can do this in one of two ways. You could type the character sequence CTRL-ALT-DEL-ALT-CTRL. This turns on CTRL and ALT modes, puts in the DEL character, and then turns off CTRL and ALT modes. Or..., you can type the orbiTouch®'s special "CTRL ALT DEL" character--this single character is shown on the Character Guide