Lispworks idle activity

In LWW, when CAPI is waiting for user input, something
seems to be happening approximately 390 times per
second.  Does that frequency ring a bell?  Does anyone
know of any kind of idle activity in CAPI (or in
Windows XP) that happens at that frequency?

I know that if I add my own Microsoft window, using
Win32 via FLI, to use at the same time CAPI is
running, I should use my own thread and message loop. 
But just as an experiment, I tried doing it in the
same thread as CAPI, using the same message loop.  In
that experiment, I get 390 paint messages per second
when the REPL is idle, and none at all when it's
executing something.

It's not a problem, since it's just an experiment and
I can just use my own thread and message loop.  But
I'm just curious about the idle activity, and why it
happens 390 times per second.


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