I'm not sure I understand what you are looking for, simon. I'd think
this would be the same as VaryByParam="none", after all, the page can
only exist in one directory.
Do they use a Label control, or some other control that the parent
page might set that uniquely identifies the control? If so, I've used
VaryByControl in cases like this.
If nothing else, you can use VaryByCustom to cache by almost any key
you can think of. Inside of the VaryByCustom method you can look at
the request object and return the path where the request is executing.
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