add description of global/user setup

g910-gkeys-setup.org

@@ -7,6 +7,70 @@ This document will explain how to setup g910-gkeys by limiting as much as possib
 ** g910-gkeys
 The configuration chosen will ba basic: assign each ~g-key~ to a key which does not exist on physical keyboard. Any key could be used, like specific localized keys which do not exist on your keyboard (example: Japanese keys for an English keyboard), or function keys above F12.
 
-We will choose to map them to Function keys `F13` to `F21`. See
-, function keys,
-`typeout` and `shortcut` look similar (and mayby could be merged)
+We will choose to map them to Function keys `F13` to `F21`. It is possible that some of these F-keys are already used on your system (example: some media keys may be assigned to `F20`). In this case, simply use another F-key.
+
+The ~g910-gkeys~ will be (skipping ~F20~ on my system):
+
+#+begin_src json
+{
+    "__comment": "I was unable to use F20, even xev does not show the keycode. It just mutes/unmutes sound, same as the G910's <mute> button",
+    "keyboard_mapping": "en",
+    "g1": {
+        "hotkey_type": "shortcut",
+        "do": "F13"
+    },
+    "g2": {
+        "hotkey_type": "shortcut",
+        "do": "F14"
+    },
+    "g3": {
+        "hotkey_type": "shortcut",
+        "do": "F15"
+    },
+    "g4": {
+        "hotkey_type": "shortcut",
+	    "do": "F16"
+    },
+    "g5": {
+        "hotkey_type": "shortcut",
+        "do": "F17"
+    },
+    "g6": {
+        "hotkey_type": "shortcut",
+        "do": "F18"
+    },
+    "g7": {
+        "hotkey_type": "shortcut",
+        "do": "F19"
+    },
+    "g8": {
+        "hotkey_type": "shortcut",
+        "do": "F21"
+    },
+    "g9": {
+        "hotkey_type": "shortcut",
+        "do": "F22"
+    }
+}
+#end_src
+
+** User configuration
+*Note*: Configuration below will make the ~G-keys~ active only when user is logged-on, as any other key.
+
+We will assign the F-keys we defined in `config.json` to any program (this includes graphical programs), or to send a string to active window (using *xvkbd*[fn:1]).
+
+*xvkbd* not only allows to send strings ("hello, World!"), but also modifiers (as ~Control-A~, ~Alt-B~, ~Control-Left~), mouse events (motion, buttons), etc... This is a subset of the *typeout* option of config.json. See ~xbkbd man page~ for more details.
+
+Below are some examples (screenshots from ~Xubuntu 22.10~). We will define the following actions :
+- ~G1~ will make the *Emacs* main window (whose title is always "*GNU Emacs*") active.
+- ~G2~ will launch a *Gnome Terminal*.
+- ~G3~ will send the string "Hello, World !" to active window.
+- ~G4~ will send the current date to active window.
+- ~G5~ will be assigned to a ~Hyper~ modifier: `G5 + a` will be `Hyper-a`, as `Control + a` is `Control-a`.
+
+All settings below (except for ~G5~) are configurable in `Settings/keyboard`, `Application Shortcuts` tab :
+#+CAPTION: This is the caption for the next figure link (or table)
+#+NAME:   fig:SED-HR4049
+./img/g910-keyboard-settings.png
+
+[fn:1] *xvkbd* is in package of same name on ~debian~ and derivatives. If your distribution does not have this package, you can download it at : [[http://t-sato.in.coocan.jp/xvkbd/]].