Fix missing MPFWindow extension, cleanup command prompt examples

docs/gmc/installation.md

@@ -25,21 +25,21 @@ Because the GMC is not yet released, pre-built binaries are not available and mu
 First, clone the main MPF repository to your computer and then check out the 0.80 development branch.
 
 ``` console
-  (mpf080) ~/git %-$ git clone https://github.com/missionpinball/mpf.git
-  (mpf080) ~/git %-$ cd mpf
-  (mpf080) ~/git/mpf %-$ git checkout 0.80.x
+  (mpf080) ~/git $> git clone https://github.com/missionpinball/mpf.git
+  (mpf080) ~/git $> cd mpf
+  (mpf080) ~/git/mpf $> git checkout 0.80.x
 ```
 
-With the MPF source code on your machine, you can then use pip to install MPF. Unlike a normal pip installation, the `-e` flag instructs pip to run MPF directly from the source code rather than using a pre-compiled version. The period after the `-e` tells pip to install the package in the current folder.
+With the MPF source code on your machine, you can then use pip to install MPF. Unlike a normal pip installation, the `-e` flag instructs pip to run MPF directly from the source code rather than using a pre-compiled version. The period after the `-e` tells pip to install the package found in the current folder.
 
 ``` console
-  (mpf080) ~/git/mpf %-$ pip install -e .
+  (mpf080) ~/git/mpf $> pip install -e .
 ```
 
 After MPF is installed, return back up to your main git folder and clone the GMC repository.
 
 ``` console
-  (mpf080) ~/git %-$ git clone https://github.com/missionpinball/mpf-gmc.git
+  (mpf080) ~/git $> git clone https://github.com/missionpinball/mpf-gmc.git
 ```
 
 ## Download Godot 4
@@ -48,7 +48,7 @@ The Godot Media Controller is, of course, built on the Godot game engine. Visit
 
 After Godot is installed, open the editor and create a New Project. Select your MPF game project folder as the project path, and choose an appropriate render engine.
 
-For most pinball games, *Mobile* rendering is the recommended balance between performance and featureset. If you plan to do advanced 3D graphics and complex rendering, choose *Forward+*. If you want to optimize your game to run on very low-powered hardware with limited rendering features, choose *Compatibility*.
+For most pinball games, *Mobile* rendering is the recommended balance between performance and featureset. If you plan to do advanced 3D graphics and complex rendering, choose *Forward+*. If you want to optimize your game to run on very low-powered hardware with limited rendering features, choose *Compatibility*. Note that you can change this setting at any time, so don't stress about it :)
 
 !!! note "Root project vs GMC subfolder"
 
@@ -69,6 +69,8 @@ From the *Editor* menu select *Editor Settings > Text Editor > Behavior*.
   *  In the *Indent* section change `Tabs` to `Spaces`.
   *  In the *Files* section de-select the `Convert Indent on Save` option.
 
+![image](images/editor-settings-indentation.png)
+
 ### Other Good Things
 
 Also in the *Editor Settings > Text Editor > Behavior* menu:
@@ -86,7 +88,7 @@ In your game project folder, create a new folder called *addons*. Then create a
 The syntax is `sudo ln -s <path to GMC repository/addons/mpf-gmc> <path to project folder/addons/mpf-gmc>`, and will look something like this:
 
 ``` console
-  (mpf080) %-$ sudo ln -s /Users/tommy/git/mpf-gmc/addons/mpf-gmc /Users/tommy/pinballgame/addons/mpf-gmc
+  (mpf080) $> sudo ln -s /Users/tommy/git/mpf-gmc/addons/mpf-gmc /Users/tommy/pinballgame/addons/mpf-gmc
 ```
 
 When successful, you should see a new *mpf-gmc* folder in the *addons* folder you just created.

docs/gmc/reference/mpf-window.md

@@ -0,0 +1,34 @@
+---
+title: MPFWindow
+---
+
+# MPFWindow
+
+`MPFWindow` is a Godot Node class provided by the MPF-GMC extension. The entry scene of the GMC project must derive from the `MPFWindow` class.
+
+## Node Configuration
+
+The root instance of `MPFWindow` is expected to have at least one child node of type `MPFDisplay`, where slides and widgets will be targeted. If multiple displays are provided and none are explicitly set to `is_default`, then the first child will be default.
+
+## Parameters
+
+The `MPFWindow` class does not take any parameters. The overall window dimensions should be configured in the *Project > Project Settings > Display > Window > Size* menu.
+
+## Methods
+
+`MPFWindow` does not have any public methods.
+
+
+## Multiple Displays
+
+For multiple displays, you'll want to create your own scene with an `MPFWindow` node as the root element, and set the window size to the maximum bounding box of all displays.
+
+Then create an `MPFDisplay` child for each display you want, and give them the appropriate size and position for where they will appear relative to each other.
+
+To get the displays to appear on the correct monitors, you'll want to lock the top-left corner of the Window scene to the top-left corner of the first (primary) monitor. Use the menu *Project > Project Settings > Display > Window > Size* and change the *Initial Position Type* to `Absolute`.
+
+You may also need to adjust the window position and fullscreen modes, depending on your operating system.
+
+~~~ note "Multiple Displays Need Your Help"
+
+    Theoretically everything exists in Godot and GMC to run multiple displays across multiple monitors, but we need folks with multi-display projects to help test and debug. Please share your experience!