Which page loads when filtering products?

Hi all,

I have a lame question which I can not find an answer for.
Which page is loading when I try to filter products by price or tag?

Site: http://www.fascinatorsonline.com.au
My page displays debug message “MAIN SHOP PAGE” and has sidebar.
If I click on, say, “Black” tag, page http://fascinatorsonline.com.au/product-tag/black/ loads, but what is it? Obviously, URL is dynamically generated.
I want all filtered views to be shown via my main page (or the page I define).

Thanks,
Rudolf