Problems Using Hyper Key modifier

[Tim Johnson <tim@johnsons-web.com>]

Hello:

I would like to map my TAB key to the hyper key modifier.

After running the following command to map the TAB key to Hyper key:
xmodmap -e "keycode 23 = Hyper_L"

xev tells me that keycode 23 is Hyper_L, but
<blush> I find that that c-h k <ret>
TAB-n only recognizes the "n". 

The TAB=>Hyper_L key is not recognized as a modifier

What else do I need to do? 

NOTE: There are many examples found by Google that show how to map
caps_lock to hyper, but I have already successfully mapped caps_lock to
control_L.

Also, attempts to map control_r (keycode 109) to Hyper_R fail
as well.

TIA
tim

-- 
Tim Johnson <tim@johnsons-web.com>
      http://www.alaska-internet-solutions.com