Using non-printable characters in passwords

Using cross-platform keyboards (SUN, Windows, Mac), how does one use non-printable characters in their passwords?

Since I work cross-platform, I use only a limited number of characters while holding down the CTRL key.

Whilst searching Google, I came across a SecurityFocus article that said: "hold down the ALT key while pressing the 1,2, and 9 keys on the numeric keypad"

Additionally, the Google search I used

      non-printable characters passwords came up with more information about recovery and programs to avoid using non-printable characters.

Are there any other combinations? If I recall correctly, a SANS instructor mentioned making use of the "Print Screen" key.

Thanks in advance

 Scott Birl                              
http://concept.temple.edu/sysadmin/
 Senior Systems Administrator            Computer Services   Temple University