A follow up question:
What do the icons in front of certain method names mean?
- green cross
- green up arrow
- orange triangle facing upwards
- orange triangle facing downwards
- red flag
Answering my own question:
Through http://wiki.squeak.org/squeak/5646
I found
http://smallwiki.unibe.ch/hermion/icons/
In particular: the red flag means that there is a 'self halt' in the method. Nifty.
However more pointers to OmniBrowser documentation are still welcome.
Hannes