AbleCommerce Shopping Cart Software

I've been asked to set up the cart on our staging server so that the site is viewable to the public but only with a Windows Login.
I see that the website needs Forms Authentication enabled in IIS for the site to work. I know I can't have both Forms and Windows Authentication.. can I?
TIA!

It's possible but not simple. Here's an MS article on one way to accomplish it:
https://msdn.microsoft.com/en-us/library/ms972958.aspx

When we set up staging environments, we lock it down using IP restrictions. Easier for everybody that way.