[OpenLayers-Users] what part of the API handles mouse drag panning?

[Michael Quentel]

What part of OL API would I find the code (actual class and function)
pertaining to panning on mouse drag (when user does mouse down on map,
then drags mouse, then releases mouse, causing map to pan).  I'm
especially interested in finding the code that triggers another request
for a new tile or set of tiles from the server upon mouse drag.  I can
read the code, but if someone can point me in the right direction, it
would help me a lot.

Many thanks.

Mike Quentel

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