>I need to send an XML purchase order https. I have it successfully working via http. I am using WestWind. According to them, I need to install the certificate into my browser’s certificate store. And then change my URL from http to https and it should work.
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>The vendor has sent me 2 certificates (tritech.crt & Yamaha_test_certonly.crt) and a key (tritech.key). One of the certificates is for us and one for them. I’m not sure if I need to install both of them? And what am I supposed to do with the key? How do I install it to my browsers store?

To install a certificat in IE go to Tools menu -> Internet options -> Content tab -> Click Certificates button.