Real World Examples

Slack

Slack operates "Chat as a Service" for corporate clients. Folks in a company chat with each other individually or in chat rooms. People in a company only talk to other folks in that company. We want them to end up on the same server.

Google Nest/Dropcam

Google is in the Internet of Things business. Nest includes thermostats and smoke detectors. Nest owns Dropcam. Dropcam is a cloud-connected camera. If I own a Nest device, I can control it from my smart phone, browser, etc. The browser and the device(s) should be talking to the same server.