Another small example, but it demonstrates something very useful.
Parent attachments. Few people know about it, many people ask about it.
In TOB (and perhaps HL2, not sure I could not test it with the current Source SDK) the output based Parent Attachment system doesn't work. It keeps UnParenting the base Parent making ParentAttachment impossible (I can't see an easier way to explain it?)
SO anyways, what I did here was that I used a point_clientcommand which triggers console commands instead of outputs and inputs, and that works fine.
So, basically using this I got a citizen to grab a small pipe. I wanted to show of barney's metrocop mask, but apparently he got a new haircut before ep1, and the new one does not support the helmet because the hair sticks out on the front of it.
It doesn't matter tho, all parentattachments works like this. Enjoy.