Global Functions
From Legacy Roblox Wiki
Introduction
Have you ever wondered how things like :Remove() and :Clone() always work, even though you've never indexed it? Here's how.
How a global command works
If you know how to use the _G[] (global) command, this might come more easily to you than others. This is basically how a global command works:
_G["Bob"] = game.Workspace.Bob
If you're in a ScriptBuilder, you can exit that script and open a new one. Put this in it:
Bob.Torso:Remove()
run that script, and Bob's torso gets removed! Why? Because the _G[] (global) command makes "Bob" available in every script.
Getting a global function
_G["Lazer"] = function(person) person.Torso:Remove() end
Now exit that script, and run this script:
Lazer(game.Workspace.Bob)
If your character's name is "Bob," you should have your torso removed.