Switch between Openbox and Gnome

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http://crunchbang.org – Hello,I know this is sort of a newbie question, but it struck me that I have never experienced this issue when using Ubuntu, which I did for five years.However, I really, really like the default logon screen for CrunchBang and enjoy using OpenBox - but I now installed Gnome3, because I somehow like that platform as well, but how do I switch beween the two desktop environments?Any help is appreciated.  J. (HowTos)