ALT codes are ranging from 0 to 255. Also, there are a few more Three-digit codes ranging from 0128 to 0255 that represent the OEM(original equipment manufacturer) codes. You can find all codes here: ALTCodeslist.com
Follow the instructions below to type the ALT symbol on a keyboard.
Yes, it's working on Windows operating system. But the majority of codes are found on the internet resources. So, users can directly use it from there.
When you try ALT-255, it prints blank space or an invisible character symbol.
Yes, it works on Windows 10. If you are unable to print it then there is some internal issue. So, you should check whether your NumLock is enabled or not. If it's not then allow it.