Real time exchanges may or may not be possible. They also make the list of things they want other students to know about them and their school. What happens first, then what, then what. They write down the steps of the tour. Each class virtually visits the other by going to its Web page.
Students then email their questions, which are then answered by the other class.
The questions and answers are then posted on the Web Pages. If so, let us know. Once you are on the e-list, post any questions you might have. Introduce the idea to your students and get their buy-in. Let other teachers know where you are, what kind and level of class you have, when you can begin and how many weeks or months your class is.