What is the exact procedure to enter character codes?

I have a character code that says: 0xCE

How exactly do I make that work for me? I think it involves the Alt key, but I can't make it work. I want to use the code in Word.

For example, I know if you hold the Alt key and hit the "3" on the number pad, then release them both at the same time you get: ♥

What's the procedure if the code says: 0xCE ???

This is an "Opus" font, by the way. It's part of a music notation program called "Sibelius". I can get most Opus characters fine in a Word document, but I can't make a Quarter Rest. That's where the code 0xCE comes in. Supposedly, if I have the Opus font, that code will give me a Quarter Rest while I'm in Word.

Thank you for any help you might be able to give.