When starting the HF project I thought it would be a good idea to be able to parse UIDs from strings. It was the fastest way to get started anyway. The idea was to parse someuid@someserver and then reuse that code.
In practice the code is littered with these checks. Halfway through the tranformation I've actually changed to using structured caller objects in the commands, So this should not be neccesary anywhere anymore. This is essentially some old junk that needs to be cleaned up. This includes IsLocal(), IsLocalUser(), GetServerId() and such type of extension methods.
