Referring to chars by decimal or hex numbers ????

[Richmond Mathewson]

Hey - Ho, bringing a discussion initiated by Sivakatirswami (or the 
"fall out" from it) slightly
more mainstream:

There are a number of writing systems that require characters for which 
there are neither spaces in the
unicode tables nor room enough in the ASCII system. 

Font for these writing systems normally contain these additional chars 
in a way where they are
referred to by their position inside the font with decimal or 
hexadecimal numbering; however

numToChar  does not work as these chars are neither within . . . . .

So, has anybody got any bright ideas (apart from typing them with a 
specialist keyboard
layout) how one can perform the equivalent of numToChar with these chars?

Please take a look at this:

http://mathewson.110mb.com/skt.html

it may help clarify what I have written above.