Want to zoom your MAC screen easy, fast and steplessly?
You only have to keep the CTRL key pressed and use the Mousewheel to zoom in and out.
On new MacBooks you can also use the touchpad with two! fingers up and down to zoom.

Hint: If you don’t scroll back to normal view, the screen remains sometimes in a “strange” mode.

Use the keyboard viewer if you are looking for special or foreign chars or if you just forgot where to find the backslash e.g.

1.: Choose Apple menu  -> System Preferences and click International

2.: Click Input Menu, then toggle the checkbox next to Keyboard Viewer

3.: Toggle the language whose keyboard layout you want to use

4.: Choose Show Keyboard Viewer from the Input menu (international symbol) on the right side of the menu bar (to the left of the Time)

So you get this… very useful:

Keyboard Viewer

There are several options to eject a CD or DVD when the mac mini fails to boot, but most of them dont work if you do not have a mac keayboard at hand. The following options work with a PC keayboard and mouse:

Press the left mouse key while you restart the mac or as alternative press [F12] while the mac is restarted. You have to keep the key pressed until the CD is ejected.