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Add the option LINKED to start() to the client APIs.

This implies:

• When the app is terminated, the stop request is sent to each linked app (not kill).

A new function is added to the API: connectLinkedApps() : list of Instance So that a special stop can be made on the linked apps with the stop handler.

The link mechanism can be implemented:

• App sa: the starter
• App la: the linked app
• Server of the starter: ss
• Server of the linked app: ls

Solution:

• The linked attribute is passed to ls.
• An event thread listening to ls is started in ss if it is not already started.
• The event thread must be synchronized.
• When ls receives notification of a terminal state for sa, then la is stopped.
• The event thread has a timeout: when there is no activity on a linked app, the thread terminates.