Updated VScript tutorial for HL2 mappers (markdown)

VScript---Basic-I-O-Tutorial.md

@@ -20,7 +20,7 @@ Open the file using Notepad, Notepad++, or any other text editor.
 
 ---
 
-### 2. Adding I/O code
+### 2. Adding the code
 
 Inside of this script file, we will add code which makes the player fire the `SetHealth` input with a parameter of `85`.
 
@@ -31,7 +31,7 @@ After you have added `SetPlayerHealthTo85`, add a `{` on the line below it, and
 Your file should now look like this:
 
 ```squirrel
-function MakePlayerDropWeapon()
+function SetPlayerHealthTo85()
 {
 }
 ```
@@ -41,7 +41,7 @@ Now we will make the function actually fire `SetHealth` on the player.
 In between the `{` and `}` lines, add a new line with `EntFire()` inside.
 
 ```squirrel
-function MakePlayerDropWeapon()
+function SetPlayerHealthTo85()
 {
 	EntFire()
 }
@@ -58,10 +58,40 @@ EntFire("!player", "SetHealth", "85")
 In the function itself, it would look like this:
 
 ```squirrel
-function MakePlayerDropWeapon()
+function SetPlayerHealthTo85()
 {
 	EntFire("!player", "SetHealth", "85")
 }
 ```
 
+Whenever the `SetPlayerHealthTo85` function is called, it will fire the `SetHealth` input on the player with a parameter of `85`, which sets the player's health to 85.
 
+Now that we've written our code, it's time to access it from the map.
+
+---
+
+### 3. Running the file
+
+Like outputs, an entity can run a VScript file and store its functions, etc. until the entity is deleted.
+
+Entities can run VScript files through a keyvalue (**Entity scripts**) or an input (`RunScriptFile`). Both of them take the filename of the script(s) to run. The extension is optional and you do not need to insert `scripts/vscripts`.
+
+In Hammer, create an entity (e.g. a `logic_relay` or an `info_target`) and use either the keyvalue or the input to run your test file.
+
+---
+
+### 4. Calling `SetPlayerHealthTo85`
+
+When the entity runs the script, it will have the `SetPlayerHealthTo85` stored and waiting to be fired, similar an output. We need to call that function from somewhere, which would then set the player's health to `85`.
+
+In the I/O system, this can be done by firing `RunScriptCode` on the entity running the script. This input should have a parameter of "SetPlayerHealthTo85()", which will tell the entity to call its `SetPlayerHealthTo85` function.
+
+You can fire `RunScriptCode` with this parameter by using something in the map or by using the `ent_fire` console command in-game.
+
+---
+
+### 5. Testing
+
+Compile your map and load it in-game. Test the `RunScriptCode` input with the `SetPlayerHealthTo85()` parameter. If you followed these steps correctly, the player's health will be set to 85.
+
+If this does not work, check the steps above and make sure you followed them correctly.