update pages

docs/index.md

@@ -21,6 +21,22 @@ It is **the tool** to enjoy any game that has trouble with Steam and/or *add ext
 
 *Windows Store*, *Reshade / SweetFX*, *Origin*, *Uplay*, *Emulators* and *more* with **no hassle**™
 
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-
 GlosSI provides its [own overlay](./Overlay.md), in addition to that of Steam.
+
+## How does it work? / What does it do?
+
+GlosSI creates and adds a (or multiple) non-Steam shortcuts to Steam. When one of those is launched, a transparent, borderless window appears in which you can use the Steam-overlay. You also get access to touch- and radial-menus and other functionality normally only present in Games
+
+In addition to that, Gamecontroller-inputs are redirected to the whole operating system, so that they will work with any game or application  
+Real Gamecontrollers are hidden from other applications, so that they can't interfere with your game.
+
+This brings full Steam-Input functionality to the desktop and any other application Steam-Input might not have worked before
+
+Games do not need to be launched using GlosSI.  
+If the "Start Application" option does not work, launch any GlosSI-Shortcut from Steam, followed by a game or application.
+
+## What this is not
+
+- a replacement for Steams controller configuration tool.
+- a Steam remote play / steam game streaming solution. (That being said, it **can** work, but is not guaranteed to.)
+- Old versions (GloSC, Global [S]team[C]ontroller) where never designed to be used with anything other than said controller, GlosSI can be used with any controller.