Cheat Engine

[Negima]

How exactly would I inject a keystroke into a process?

[Symbol]

You don't inject keys into a process.
You send them to a window.

This has been discussed in this forum 1000 times, the first page has like 5 topics about this.

[hcavolsdsadgadsg]

You can whisper your sweet messages to the window, or generate a keystroke with SendInput.

I think you might want to get the basics down first, you're all over the place. This would become much clearer if you actually spent the time to read and experiment a little.

[dnsi0]

Pma, SendMessage, Translate/DispatchMessage

And MSDN is your friend.

[jackyyll]

[Fuzz]

InjectMessage();

By irwin.

[dnsi0]

FindWindowA then use that handle to PostMessageA.

If you making something for maple u will need hookhop which trampolines over the 5 byte jmp hook.