identify shopping cart outside of zen directory?

[hpowers]

I have zen installed in /shop off my root.
I have a blog installed in my root
If someone navigates to /shop and adds something to their cart, then returns to my homepage for example (index.php), is their a way to check if they have anything in their cart and display something?

[kobra]

Check the free addons section for a module for this

[hpowers]

any hints on what to search for, I tried "shopping cart" and just got a bunch of sideboxes.

[kobra]

Sidebox Anywhere
Dynamic Sideboxes