[hatfieej]

I think it was a language they developed to be used with IUP. Original research paper: http://webserver2.tecgraf.puc-rio.br/iup/download/spe95.pdf Under "Resources->LED" on the site there is some more information: http://webserver2.tecgraf.puc-rio.br/iup/en/led.html

[eggy]

Check the site. There's a nice example there. It is basically a script-like way of building interfaces. The cool thing is that it is loaded as a resource, so you can edit the LED script after compiling, and as long as you haven't changed any of the identifier names, you can modify the GUI.

I am going to try that this week. Sounds like a nice compromise between the newer 'Immediate-Mode GUIs' and the standard event-based one. I can see it as a way to let the user skin your app within your control of how much they can modify.