Shellcode from ASCII

From: martin rakhmanoff (jimmersat_private)
Date: Wed Jun 25 2003 - 03:09:20 PDT

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     ('binary' encoding is not supported, stored as-is)
    Hello
    
    
    Usually when coding exploits one needs to escape null bytes in shellcode. 
    To do this XOR is often used. My question is: is it possible to escape not 
    only null bytes but also non-ascii bytes?
    In other words is it possible to have shellcode (for Windows 2000/XP/2003) 
    that consists of bytes with codes 0x21-0x7e?
    
    Thanks
    Martin
    



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