Excel: force uppercase

[Dan <dan27649@xxxxxxxxx>]

This is a niggle, doesn't qualify as a nag, somewhat of a curiosity,
but definitely a "would be nice if".  <g>

I would like a way for lowercase letters entered in an Excel cell to
automagically be uppercased when focus leaves the cell.

I am aware of the UPPER() function, but that entails entering data in
one cell and seeing it uppercased in another.

Is there a way that a macro can be invoked to run on a cell once focus
leaves that cell?

BTW, this is Excel 2002 SP3