Play several practical buttons in PowerPoint courseware

When demonstrating PowerPoint courseware, if you want to implement the following special features, you do not have to stop to explain specifically through the menu call, knocking on a key on the keyboard can be achieved, does not affect the effect of lectures.

1. During playback, if you want to make the screen suddenly black, you can press "B" or ">", press any key to restore.

2. During playback, if you want to make the screen suddenly white, you can press "W" or "<", also press any key to restore.

3. In the middle of the play to quickly return to the start position to restart playback, press "←" or "↑".

4. To quickly pull up the drawing pen when playing, press the combination key "Ctrl+p".

5. To quickly hide the mouse pointer when playing, press the combination key "Ctrl+h".