I'm not even sure how to ask this question (not sure if this is a subdomain, add-on domain, ISAPI rewrite, etc. question)
Let's say I have an e-commerce site at www.mainsite.com that has great organic search results.
Now I want to sell a new line of widgets that are sort of related to what we sell at www.mainsite.com. There's a turnkey e-commerce provider (3rd party) that we can leverage to sell this extra stuff.
I don't want to create a new domain for this third party site nor do I want to do a subdomain as my understanding is that we will lose or not be able to take advantage of our good SEO with both of those approaches.
So what I want to do is have this new "site" show up as a subdirectory of our main site.
So when a user goes to www.mainsite.com/newsite they are really on some other server (www.newsite.com) yet the URL in the browser client is www.mainsite.com/newsite (this /newsite will have it's own look at feel, etc. as it's essentially a totally different site, just "held" in a subdirectory of the main site).
Does this make sense? How would this be done? What do I need to ask my hosting company to do to make this work? (hosting is on an IIS server)