title: why does simulating keypresses not work for alt+tab and ctrl+alt+del?
body: <p>so i wanted to try and simulate some key presses and i used the scripts found  here: </p>
  
  <p><a href="https://stackoverflow.com/questions/11906925/python-simulate-keydown">Python simulate keydown</a></p>
  
  <p>and </p>
  
  <p><a href="https://stackoverflow.com/questions/13564851/generate-keyboard-events">Generate keyboard events</a></p>
  
  <p>when I run these scripts, although the buttons are being pressed, it does not bring up the change windows thing or ctrl alt del menu on windows 8.  however, on a windows 7 computer the alt tab did work.  Why does it not work on windows 8 and is there a way I can simulate these strokes?</p>