ptkdb

Awesome! nice feature.  Prior to this I kept an editor open just for saving and reusing variable expressions I wanted to track. 

BTW:
you may want to attach a link to download this file as the browser has misinterpreted several intended characters of the cut-n-paste code

left arrow became the literal <
right arrow became the literal >
ampersand became the literal &
quotes became the literal "

Anywise once I made the above fixes this feature worked great