This program is completely authored by me.
Any similarity to other programs is due to the fact that there aren't hundreds of different ways to efficiently write this program.

I have included source in control.asm, which you can open with a text editor like Notepad.

This program takes up only 46 bytes of RAM.

This program is completely useless aside from being a GREAT prank.
Well, it is useful if your calculator's keyboard isn't working.

Requirements:
You must use the I/O port/cable, NOT the USB port/cable.
Run ONLY on the calculator that you use to control (Calculator A).
Calculator A must be a TI-84 Plus C Silver Edition.
Calculator B, the calculator being controlled, can be any calculator in the TI-83/84 series.
Calculator B must not be running a program or performing a calculation while you are pressing a key on Calculator A.
The buttons on Calculator B will still act normally; you can, if you want, just use Calculator B.
To exit the program, press ON.
This means that the ON button on Calculator A cannot be used to control Calculator B.

In summary: all you have to do is run this program on the controlling calculator and plug the I/O cable into both calculators.

I am not responsible for any accidents happening to your calculators, such as resets.