>cvs -d:pserver:guest@cvs.limewire.org:/cvs co core
>cvs -d:pserver:guest@cvs.limewire.org:/cvs co gui
>cvs -d:pserver:guest@cvs.limewire.org:/cvs co lib

You can also do:
cvs -d:pserver:guest@cvs.limewire.org:/cvs co core gui lib

No difference at all except less typing. :)