I searched the forum as well as google and could find nothing on this, so am posting here. Maybe it's old news.
WARNING: Make a backup of the C file used in the test below.
Using uVision 3.05c (and who knows, maybe other versions as well) open up any C file, place the cursor anywhere (it seems) and press Ctrl+U. Save the file, then reopen it. You'll notice that every character in the file is now lower case. Perhaps it's every character after the cursor ... I'm not sure of the specifics.
Considering that C is case sensitive, you can imagine how this could cast a gloom over ones day.
That's it. Obligatory condescending responses may now commence.
... would sound like quite a good choice for a hotkey to "Convert to Uppercase"
(in MS Visual Studio, it's Ctrl+Shift+U)
CTRL-U -> lowercase (for a marked section) CTRL-SHIFT-U uppercase
:-)