Checkout RTC scm using Java API

I'm trying to checkout files from RTC's scm using Java API but I can't find any documentation which contains required information. I've managed to successfully login to repository. But I can't figure out how to choose specific project and retrieve files from it's scm. Could you please give me some hints? I've found some documentations but it looks like it describe how to do such things when creating plugins. But I couldn't find anything how to do it in standalone application.