I often get LaTeX errors or warnings in the output window
which I don't know.
I usually use Google[Groups] for learning what is wrong.
For finding applicable sites and posts I need the error
text. At the moment there are only two possibilities:
1. Copy the message by retyping it (nothing for lazy ones
2. Open the generated log-file with an editor and copy the
message from there.
It would be much easier if TeXnicCenter had a small
context-menu in the output window that allows copying
line[s] to the clipboard.