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my new app should run as a sort of networking daemon - and should not reveal itself in the task switcher or in the dock. how can I suppress this?

LSBackgroundOnly, LSUIElement

great! only the instructions on those pages are for Project Builder - no such menu options are available in XCode as is described there.. :-( Anyone able to help out on this?

Yeah, put the desired attributes in your Info.plist file. –EliotSimcoe