|It is possible but it is not straight forward as you will need specialised software to do it, possibly software writen specifically for you application.|
Do a search on google for distributed Processing. You might also look up grid computing which is a method of distributed proccessing.
The computer I am typing this on is part of a distributed processing system running on behalf of the University Of Washington which is not bad considering I am five thousand miles away in the UK. A similar thing can be done over a LAN.