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Haven't tested it but I remember the runone /alternate shell key did that many years ago. I also remember enabling seamless flags to stop showing server side icon/notifications in the clients systemTray. This was many many years ago. May not be related at all, but something to thing about.

Yeah, I seem to recall that seamless flag as well. I think they're all seamless by default now?

Well the published apps are referenced by seamless apps. But Being they have the CAX tool that would tell all seamless flags are not enabled as it per application. Again been a long time since I had to dive Into this. Not trying to steer you wrong.