From Garry's Mod
Executes a Lua script either relative to the current file, or absolute(relative to the /lua/ folder).
|NOTE||The file you are attempting to include MUST NOT be empty or the include will fail.|
|NOTE||If the file you are including is clientside or shared, it must be AddCSLuaFile'd or this function will error saying the file doesn't exist.|
The name of the script to be executed.
Anything that the executed Lua script returns.