pin to taskbar is a standard windows 7 feature, as is pin to start menu. with the former you get a handy, largish icon at foot of screen to use for launching programs.
it does as you say - try to spawn a new instance, but calibre is smart enough not to have 2 active instances, as the "close to system tray" option in calibre has been keeping it alive. - so I guess that I am just suprised that calibre does not detect that instantly & behave as if I'd clicked the small system tray icon.
watching with task manager.
state1. calibre closed, system tray icon present - calibre.exe is a live process.
state2, launch calibre ( from start bar, task bar, whatever) - see 2 instances of calibre in task manager, cpu at 50% for a couple of seconds, then a return to one instance & low CPu usage.
state 3. close calibre ( = shrink to system tray) - no change in live processes.
I could just minimise to task bar when not in use but that takes up more screen real estate. ( standard win 7 behaviour again - minimised programs take up about 1" of task bar space - just enough to show program name),
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