 ""; he quickly added it was a reference to Windows NT logon procedures ("Press Ctrl + Alt + Delete to log on").During a question and answer presentation on 21 September 2013, Gates said "it was a mistake", referring to the decision to use Ctrl+Alt+Del as the keyboard combination to log into Windows.Gates stated he would have preferred a single button to trigger the same actions, but could not get IBM to add the extra button into the keyboard layout.