I'm using a simple shared editor such as collabedit or similar. You send the link to the shared space along with the phone number for the interview, and you let

I'm using a simple shared editor such as collabedit or similar. You send the link to the shared space along with the phone number for the interview, and you let the candidate know that there will be some simple shared exercises so they need to be at a computer. And then you ask your questions, and do FizzBuzz or similar, and watch them code.