Roundtrip, round trip, round-trip?

[Odile Sullivan-Tarazi <odile -at- mindspring -dot- com>]

What would you do with this term as a noun in a software environment? 
Closed, open, or hyphenated?  If the open two-word form, you'd then 
hyphenate it as an adjective preceding the noun it modifies?

I'm familiar with what WM's Collegiate, RH, and AH have to say.  I'm 
wondering what the latest trend is in the real world.  I'm tending to 
see it spelled open, and wondering whether it ought actually to be 
(at this point) one word. In terms of our general usage, we do spell 
some words in the process of change as one.  But I don't have a sense 
of whether that would be taking it too far with this one just yet.


Odile
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