Yes, in the main menu, select→ → . Change the to Disable Screen Saver.
Use the print screen key to take a snapshot of the whole screen, and alt+print screen to take a snapshot of the active window.
The login is linutop and the password is blank (unless you've activated the lock mode).
You can enable compiz (if the hardware supports it) in the last tab of the appearance setup tool (→ → ).