"Cheats" may be entered in the Developers Console which is accessible by pressing the "`" key (its above Tab and under Escape). But first the Developer Console must be enabled by going into Options then Keyboard then Advanced. In Advanced there should be a check-box to enable the Developer Console.
Once you have the Developer Console working you have to enable cheats by typing "sv_cheats 1" into it. After that you can use cheats like "no_clip", "no_target" and "impulse 101".
Many other cheat commands can be found on the internet but as you type into the Developer Console a list of suggestions will appear, as you type more the suggestion will be refined. This helps you to type it quicker by not having to enter the whole phrase.
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If you want the built in cheats, you open up the console and type sv_cheats 1. Then you can use cheating commands such as impulse 101 (one of every item), god, and noclip (fly through walls). If you want to hack it in the sense that you make your own maps and weapons, try the source sdk.
No, The Orange Box does not include Garry's Mod (instead it has HL2, HL2 EP 1 and 2, Portal and TF2). I wish it did have Garry's Mod.
There are but if you use any cheats your account will be deleted.
The answer is use Pokemon fire red cheats.