How to make a popup help/tip window for the workspace

Anyone have any tips on how to make a "tool tip" like window in the D6
workspace?

Next on my Intelli list is to give parameter help like in Idea and Eclipse.
Pressing something like CTrl-Alt-P while on a method would give a little tip
window showing the parameter names and any comment at the top of the
declared method.

I'm not sure where to start looking for how to do this?

I saw an article from Steve Waring on reusing tooltips, but it seemed aimed
at controls like butons and stuff, where this would be a tip for the
Scintella editor I guess?

Tim