If you post as a GUEST with a handle, obviously you are wide open to have others posting in your name, but that doesn't apply if you sign in as a member, unless you have been foolish enough to let some nasty know your password.

Sometimes people explain that they sign in as GUEST with handle because they are using an unfamiliar computer, but I never understand that, because it only takes a couple of seconds to sign in.

Being a GUEST without a handle seems strange, especially when you get two hammering away at each other in the same thread. But I suppose if you get fed up with the way some people tend to carry on verbal assaults on named members from thread to thread it makes some kind of sense.