Remapping the Tab Key?

[William Reardon]

I'm trying to remap the tab key to call a custom elisp function, but
can't quite get it work.  Here's what I have:

(global-set-key [tab] 'indent-or-complete)

I'm pretty sure the problem isn't in the function, as I can
successfully remap it to ^t via

(global-set-key "\C-t" 'indent-or-complete)

and it works as expected.

I've hunted around a bit, tried the various tricks suggested in the
FAQ, but no luck.  Any suggestions?

I'm running GNU Emacs 21.2.1 on Mac OS X 10.3.9.

TIA!
-Bill