How would you create a tracking pixel?

[Brian Dunning <brian@xxxxxxxxxxxxxxxx>]

I want to create a pixel that can be used to track certain activity  
on the site. I've got it working fine: I just mod_rewrite  
"spacer.gif" to a PHP app that does what I want it to do; but then I  
don't know how to actually return a blank pixel. Can anyone point me  
in the right direction?

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