Add Custom Characters to Documents Using the Numeric Keypad

This article explains how to modify the Windows registry to allow for hexadecimal input when entering special characters into a document via the numeric keypad.

http://vlaurie.com/computers2/Articles/specchar.htm

It says "open Regedit and go to the key HKEY_CURRENT_USER\Control Panel\Input Methodand add the string or REG_SZ value EnableHexNumpad. Set the data value equal to "1" (no quotes)."