Multiple users simultainiosly

I have an HP PAVILLION, with a Pentium Dual core. Not sure about other specs, and regardless it appears not possible. How big, or type do I need. I have a wife and daughter in school,& myself. Or would getting separate p/c's be more economical?
 


What are you trying to do here? Just share a PC with others? Share data? You can't all use that computer at once is that is what you are trying to do.
 
I was thinking about having two people using the p/c simul., one doing a writing assignment, while a second might be surfing or facebooking. but I'm beginning to see that p/c means personal computer, not plenty computer