User connection from/between two installs in same domain?

Hi,

Would you know of any way to connect a user (having socially logged in) from one sub-install and a deeper install within the same domain?

Meaning, someone logging into “www.site.com/subinstall” will still be recognized as being logged in at “www.site.com”; and vice versa.

I’d have worded it as Subdomain and main domain install but that’s not my situation since I’ve got my installs as merely subdirectory installs.

I know this might be a stretch, but thought it worth asking nonetheless. ??

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