How do i Make a window that is unbreakable? Please don't assume that i know how to make a window at all. I don't. So, how do i make a window at all, then how do i make it unbreakable. There we go
Make a brush, texture it with glass. Voila.
Yeah, select the brush, then press 'N' to set its classname to 'func_breakable'. Then check THIN so it acts as glass. In the texture library 'common' are some handy glass textures too.