You use an IDE^[1] to edit the Powder Toy's source code^[2] and then compile^[3] the source code to make it an executable^[4]
You must learn a computer language^[5] to do this. Powder Toy uses C^[6] so if you want to mod TPT, learn C.

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^[1]http://en.wikipedia.org/wiki/Integrated_development_environment
^[2]http://en.wikipedia.org/wiki/Source_code
^[3]http://en.wikipedia.org/wiki/Compiler
^[4]http://en.wikipedia.org/wiki/Executable
^[5]http://en.wikipedia.org/wiki/Computer_language
^[6]http://en.wikipedia.org/wiki/C_%28programming_language%29

@cctvdude99 (View Post)
@Neospector (View Post)
Thank you two very much. I might want to be some sort of administrator thing when I grow up, 'cause I like that kind of job. Wikipedia? Hmm.. I don't know, maybe.
Please, #usethesearchbro