wow I haven't heard of TCL for years (excluding TCL/TK of course), I used to run a large patient management system across a hospital system that was built on TCL and ran on top of Solaris (5 from memory). While the software itself was antiquated for the time (2011~) it was pretty solid and fast despite running on relatively low spec hardware for the number of clients. I remember the 'upgrade' path was a Windows app that other than providing a more user friendly interface what was essentially providing the same functionality with the addition of a mouse curser required a hardware of a factor of something like at least 40 times the performance to run at a similar scale.