How to make a Neopets program?

[xHearMyRawrr]

Just asking how exactly do you MAKE a neopets program?

[Zachafer]

Just asking how exactly do you MAKE a neopets program?

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[Celestial]

Pretty much you need to learn a programming language like C# or Python, depending on your needs.

Most probably C# for windows

Learn how the browser works, cookies, POST/GET requests.
Learn to monitor the requests with an app such as Fiddler
Simulate the requests through the language you choose

It's all just sending and receiving messages really, maybe with some encoding that you may need to break through a lil reverse engineering (e.g. scoresending)