Updated Scripting: set & variables (markdown)

Scripting:-set-&-variables.md

@@ -1,20 +1,45 @@
-`set` command
+The `set` command defines or creates variables. Variables are fundamental to any programming. 
 
 ## Usage
 
 ### Syntax & Example
+`set <var> <arg>`  
 
-### User Defined Variables
+
+### User Defined Variables  
+**Example 1**  
+`set VARIABLE "argument"`  
+`echo $[VARIABLE]`  
+
+**Output:**    
+> argument
+
+In this example, the value of the variable called **VARIABLE** is _argument_. The value is re-definable.
+
+`set VARIABLE "negotiate"`  
+`echo $[VARIABLE]`  
+
+**Output:**  
+> negotiate
+
+Variables may hold empty or null placeholder values.
+
+`set VARIABLE ""`  
+`echo $[VARIABLE]`  
+
+>
 
 ### Environmental Variables
-These are variables with values that cannot redefined. 
+These are variables in which their values cannot redefined. 
 
 **Example:**  
 `echo $[GM9OUT]`  
-**Output:** 0:/gm9/out
+**Output:**  
+> 0:/gm9/out
 
 `set GM9OUT "0:/gm9/in"`  
 `echo $[GM9OUT]`  
-**Output:** 0:/gm9/out
+**Output:**  
+> 0:/gm9/out
 
 ## Notes