Odd systray interface?

Something interesting - most of my applications work fine with
the systray, however I noticed I had to do something special with
CachemanXP:

,----- [ CachemanXP help file ]
| You must let CachemanXP know the name of your Shell executable,
| to do it create a new Shell , example for LiteStep:
| 
| [HKEY_LOCAL_MACHINE\SOFTWARE\CachemanXP] 
| "Shell"="Litestep.exe" 
`-----

I'm just curious as to what this program might be doing
differently from others.

-- 
Ravi (http://shell-shocked.org)

"Quantum Physics: If you ate pasta and antipasti, would you still
be hungry? - George Carlin"


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