crontab is a program that is used to schedule programs to run at certain intervals. It's used in OS X to schedule things like the updating of the index that makes "locate" and "whereis" function. You update crontab through a terminal session.
"anothermacguy" posted on the MacNN forums that he had found a GUI front-end for crontab. Sven Schmidt is the author, and you can find information and the program on his homepage.
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Mac OS X Hints
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