Is it possible to use the engine for development without installing any games?

Hi, first of all apology for my bad English.
I’m 16 and I only learned to build games in Python with cocos2d-python / pygame by myself.
I thought you can simply import the head files then use functions in it to write game logic in that specific programming language. Does the same logic work for ioquake3? Do I import a *.h file then start to write code? Or do I compile the engine, then download games? How can I get the engine to work?
Please send help, like, how do I write a basic Helloworld with ioquake3, thanks! :3

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For Quake 3 you have to take and modify the existing code instead of just importing headers and calling Quake 3 functions. I wrote some suggestions for creating new games at Ioquake3: Where do I get started? (dev) and creating Quake 3 mods (requires install Quake III Arena) at Learning quake3 modding.

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