Where I work on some of the desks we have two desktops one for our normal work and one for system testing.
There seems to be some sort of switch box which connects both PCs together so that it shares the LCD, keyboard and mouse. To switch between the desktops we hold on the scroll wheel and press right click on the mouse.
Can anyone tell me how this is done as I am keen to do this at home?
I have had a look at the setup at work but they are well hidden under the desks.
There are cheaper ones but I've never used one, the thing to do is check whether the others who have bought one like it as you appear to be doing. The link you supplied is for connecting a peripheral such as a printer or scanner to more than one PC and as such I don't think it would do what you want. Maybe someone else will say I'm wrong and correct me.
Basically I would like another switch device to add an additional computer so i can run windows 2003 and SQL server. I may even use software to split down the second machine and run Linux on it as I am very keen to learn this.
My current machine would not be able to handle to operating systems