[Robert Abitbol] Many years ago, in the ''glorious days'' of the pioneer DOS, there was an amazing database software called Rapid File programmed in Forth. 

I suspect it was in fact a comma-delimited database therefore it was occupying close to nothing in terms of space. It was small, fast, elegant, innovative. 

It was the kind of stuff [RS] would write. 

See more here: http://c2.com/cgi/wiki?RapidFile (I wrote most of the text on that page). 

I think Tcl/Tk would lend itself to such a database. 

If anyone is interested in writing something similar in Tcl/Tk, let me know. My e-mail address is on my homepage.