I have been able to infer, from context, that OT means "OFF TOPIC", that BTW
means "BY THE WAY", and even that <G> lies somewhere between :-) and :-)).
However, IMHO has repeatedly resisted my interpretive capacity, and has left
me completely clueless. I give up. Would somebody please tell me what IMHO
means?

Is there some reference source for these things?

Stewart