The session focused on teaching group text messaging functionality in iOS devices. Diana Brent demonstrated how to create and manage group messages, including adding contacts, naming groups, and using features like FaceTime and phone calls with groups. She explained the limitations of group messaging, such as the 32-person limit for iMessage groups and the need to use SMS/MMS when including Android users. The demo covered various methods for adding contacts to groups, including using the To field, search functionality, and phone numbers.