Is it possible to create a small button, i.e. 10x10 pixels or so, that when clicked, would be able to open/unhide say a calendar or clock, with the button still residing in it's original position and overlapping one corner of the new window, so that when clicked again, it would close/rehide the new window/frame/app? If so, how would it be done? xLabel? Hotspots? Any ideas are appreciated, thanks!!!

why make a button? why not make a hotkey so it won't get in the way of full screen apps? your idea requires xlabel to make the button and you could use mzscript to make your own hide/show bangs.

how would a button get in the way of full screen apps? would it overlay the full screen image? and how would i go about making a hotkey to show a calendar then?

Presumably you have a bang command that hides and shows the calendar - the one you would have triggered with the button. Just assign that bang to a hotkey instead, in your hotkey.rc file.

a button would be cooler.. IMHO.

In answer to you button question: Yes its all possible with xLabel and Rainlender.

read the docs, look at some themes that uses buttons, youll figure it out (thats half the fun :D)