TAD now has internal group chat!
In the latest version of TAD, we have implemented an internal group chat system. Try it out. It is under the help menu inside TAD. You would need to create a group name for you and all your other people in that group. The group name is registered at https://tad.in.net/groupchat The password for the group should be shared privately with your group members. The members can be from your office or anywhere on the Internet. Obviously everyone should be working inside TAD, for all to chat together.
Note: You must have Internet Explorer 11 in your Windows, because it gets embedded inside the group chat.
Not using TAD? It is a free design system for architects. Go here: https://teamtad.com