PubNub can power your application to be able to have multiple users collaborate and interact with each in real time.
Your app will include:
Publish: Update users in real-time with mouse positions, drawing, and name updates.
Subscribe: Listen for and view other mouse positions, drawing, and name updates in real-time.
Presence: Get currently present users and listen to new presence events. Generate new drawing pointers that track other user mouse positions and names.