asks: "This may seem kind of a nonsensical question, but it has been bugging me for some time now. When does a window manager become a desktop environment? Where's the point of transition? I've been a big fan of Window Maker for some time now, and here's the thing; it has wmfinder, FSViewer and a few other file managers, it has postilion and Aileron and probably other email clients, it has a ton of dockapps to do most desktop, filesystem, LAN, ppp etc. monitoring and even admin work and gawdknowswhatelse. It even has scripts to change screen resolution and colour on the fly. So can it start calling itself a desktop environment like kde,gnome,cde and xfce? And if not, what else is needed?"
A simple answer might be: 'when it does more than manage windows', but that would describe most of our current crop WMs, wouldn't it?