First user-based control locking mechanism [Ignition 8]

[pturmel]

See this similar recent discussion:

Closing Vision Window instance on separate clients

This is extremely difficult and fragile, as described. Instead, consider allowing the window to always be opened, but all of its features disabled by default. Then, set up a couple memory tags. One to hold the client ID of the client "in control", and a second to contain a datetime timeout value. Enable the controls on the window while the particular client's ID matches and the timeout timestamp is greater than now(). Use a button on the window to "claim" control by writing the current clie…

That one is for Vision, but a similar technique would be reasonable for Perspective (using session ID instead of client ID).

One big caveat:

If your application needs any kind of jog functionality, Perspective cannot do it. (It cannot ensure a jog command turns off when a button is released.) It is non-trivial to make reliable in Vision, but is at least possible. Search this forum for "Momentary" for detailed discussions of why. (Some quite heated.)