Glass?

I was wondering if anyone knows the symbols for making unbreakable glass compile without any errors. It seems I'm having troubles with this...

It's in the HEK tutorial. Put % at the end of the shader name.

It's %
Insert it at the end of teh shaders name.

% is two-sided, iirc. There's another symbol you add to make a surface breakable (it must be two-sided to be breakable) so you just omit that. If you want the window facing directly out into the skybox (hey, sometimes you do) then you don't want it to be two-sided, so you omit the % as well.

He said "unbreakable" glass in his post >.<?