Who is on the project, the People chats, invites, and handing a project over.
Two places share the name. People on the rail is the chats between the people on the project. Settings › People is who those people are.
A People chat is the same as any chat (a thread, a Doc, Tasks, Files, Context), listed apart from the chats with Flexi. What people say there goes straight into the thread; Flexi is asked only when someone writes @Flexi, and then he answers what was asked and leaves the rest to you. Everyone else on the project gets an email when someone writes and they are away.
Settings › People lists the Owner and the Team members, with a Flexpert badge on a flexpert. Team members work in every chat and see everything.
/join/… that works once, for seven days, and the link is shown to copy too, to send another way.Flexi cannot invite, remove or hand over; those are yours, here.