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This probably applies to either Vista or Windows 7...they both have a feature where it will group windows from the same app under a single button. However I have one application I want it to never group -- specifically an X11 server, where different windows are separate apps and not related (ie, I don't want it grouping my xterm window along with my accounting software window, just because they are both owned by xserver.exe).

I don't want to turn it completely off, I like when it groups all my Explorer windows together for example. I just want to exclude/whitelist/? a single application, xserver.exe, from having its windows grouped.

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up vote 9 down vote accepted

7 Taksbar Tweaker should do exactly what you want:

This programs enables you to tweak your Windows 7 taskbar. The tweaks are divided into three sections:
Taskbar items: control taskbar items related stuff, like middle/right clicking, hovering, dropping, etc.
Grouping and combining: disable grouping, allow to drag windows between groups, force/disable combining, etc.
Other taskbar options: mouse wheel options, double/middle clicking on the empty space of the taskbar, and misc.

enter image description here

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Haven't tried it yet, but looks like it does exactly this. Thanks! – davr Mar 19 '11 at 4:01
Wow! This program is a must for every Windows 7/8 user!! – Konamiman Dec 11 '13 at 11:52
Excuse me, but now does this do what the asker asked? The requirement was to not group only some applications. – JimN Jul 10 '15 at 0:25
It doesn't show in the screenshot, but there are per application-ID settings when you click on the Taskbar Inspector button. – Flip Apr 19 at 8:12

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