Can i install os lion on an external drive

Is it possible to install OS Lion on an external Hard Drive and use that to boot up a laptop computer?
Thanks,
AS

RN,
Thanks for the link.
Regarding "homework", I am not sure what qualifies in your world but I had done a fair bit of searching for instruction upfront, installed the program, and again searched the apple database (presumably not the right keywords) when it didn't work.
Really appreciate you taking time to help.
Regards,
AS

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