KDE: how do I make applications present on all activities by default

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http://unix.stackexchange.com – When I'm at work, I use KDE activities and map them to my projects. I always use the same applications on every project, so I'd like to keep my windows visible when I change the activity. For the moment, what I do is go through every window, right click on the title bar, and check the checkbox that makes the window appear on all activities. How can I configure my windows default value for this choice? I'd like every window to appear on all activities by default. (HowTos)