If your T-Mobile's G1 Android firmware is version 1.0 TC4-RC29 or earlier, you have an unintended extra "feature" - open the slider, press 'Enter' to pull up the application tab, then type in "reboot" and press 'Enter' again. Your G1 will follow your command and reboot your phone.
This bug causes Android to interpret words as commands and executes them as "superuser privileges." It is not yet...
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