Tandem Computing

Hello people of Tek Syndicate! I recently aquired two identical acer desktops from work, they have Pentium 4's and no dedicated graphics. I haven't really checked their specs too much yet so thats all I know about them as of now. Anyway, I was wondering if there was any way to run them in tandem to turn these two slow as hell computers into something fairly usable? I want to do this mainly because it would be freaking awesome and would probably be fun to do. I really only want them to run Office and websites like Pandora and YouTube. If this isn't possible I'd love to hear you guys' suggestions on what I should do with them.

Thanks