Temporarily change your computer ID and version string!

What is it you may ask?
Change the computer ID?
Yes! Its now possible (not for real, it fakes your ID)
You can spoof it for rednet and/or other programs that depend on checking your ID.
Its simple and all of the UI is text based.

https://pastebin.com/wkAdgAVE is the pastebin link

Edit: Program is in public domain. Do whatever you want with it.

There are so many better ways to do this dude.

Alternatively, use peripheral.call or the modem API instead of the rednet API, then you don't have to spoof your ID.