Transfering projects from one machine to another.

hi
all
if we have stand alone installations of p5 on two different machines, and we are transfering the projects from one to another.

what should be the process, coz when i try to import it updates the whole project and the projects takes whatever data date in in old and starts new project from there.
can anyone explain how to use check in and check out facilitis in p5.

thanks in advance

cheers
mangesh