Can it be made to function like one giant computer?

Update: We all know that with our PC, it can be used for processing a number of functions. Can we create a network of workstations, eg, 4 to 5 PCs, and make it functions like one PC? This is to say, it can be made to function and behave as if it is only one PC and anyone outside interacting with it will not know he is... show more We all know that with our PC, it can be used for processing a number of functions.

Can we create a network of workstations, eg, 4 to 5 PCs, and make it functions like one PC? This is to say, it can be made to function and behave as if it is only one PC and anyone outside interacting with it will not know he is dealing with a multiple of PCs.
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