Very simple one, being a computer numpty I hadn't seen this before, maybe everybody else has, but press ctrl - alt - down arrow!!!!!!!!!!!!!!!!!!!!!!!!!!

worth doing to the boss's PC

strange, just tried at home and it doesn't work! Does on the work PC!

Yes/... Just scrolls up / down the page. (Win XP)

What Operating system is his PC?.

Yup, me too.................we're on XP at work and I'm on XP at home, so confused!!!

At work ctrl - alt - downarrow turns the monitor display upside-down!!

the cursors set the screen in 90 degree increments.....................very amusing!

I suspect that this depends on the display driver, and hence on the type of display adaptor (Nvidia/ATI/etc) fitted to the machine.
Cheers
Richard

In XP Shift-Alt-PrintScreen will make a nice mess of the screen (press again to revert back).

It is largely machine dependant - a lot of new HP machines do it, you can also put some on their sides