why are passive checks scheduled?

[PGuth at corp.terralycos.com]

When I look in the scheduling queue on my server I see checks scheduled 
for services which are passive only (they have active checks disabled). 
Does this mean that I did something wrong?  Or is this the way nagios 
works? 

I'm worried that Nagios may be actually spawning processes to handle these 
checks (which simply exit since there's no check to do).  The box 
periodically has a lot (like 500+) of Nagios processes running.  This is 
the top layer of a distributed monitoring setup so it runs virtually no 
active checks, it just collects passive checks from several lower layer 
servers.

Actually I'd be interested in understanding how/when Nagios spawns 
subprocesses in general.  I don't really understand how it works under the 
covers and I think I may need to to get it to scale the way I need it to 
(the top layer server is going to have upwards of 15,000 passive checks 
reporting into it).



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