Not at all, Sandra. Many guests are welcome. Trolls are people (not necessarily guests) who deliberately post inflammatory or contentious messages with the intent of causing arguments amongst other posters. Sometimes the same person will post under several 'guest' names, apparently arguing with him/herself to keep the pot boiling. The intent appears to be to cause as much damage as possible to the forum and to other posters, presumably for fun. I guess the same motive lies behind many of the viruses and other malicious code people send through the internet. Some people just can't stand to see others enjoying themselves.

Andrew