really simple shell question (program launching)

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http://crunchbanglinux.org – I mostly feel ashamed having to ask this question, but I can't remember the answer or even think of the proper terms to do a Google search.When I launch a program from within a gui file manager (thunar in my case), the program launches and I can then close thunar and the program will continue to run.But if I launch a program from a terminal window, as soon as I shut down the terminal window, the program ceases.  My question is: How do I launch the program from the terminal window so that is will continue after the terminal closes?Thanks,David (HowTos)