Klicko... In the Classic days, if you wanted to use a window that wasn't frontmost, you could click anywhere on it to bring it to the front. Mac OS X introduced a feature called "click-through" where certain controls, like the "traffic-light" buttons in the window title, would work even for background windows. Applications can also make other controls, or even the entire window, work with click-through.
Klicko blocks click-through inside application windows. You can make a list of included or excluded applications, or hold down a modifier key to momentarily override Klicko.
Klicko is a System Preferences panel written in Cocoa. It doesn't hack the system, other applications, inject code or do anything magic. Klicko also has two other convenient functions: window maximizing and bringing all windows of some application to the front.
RAINER BROCKERHOFF A new build, 1.1(181) is out. Use the built-in "Check for Updates" function. It fixes a small incompatibility with Exposé (you had to click twice in some cases) and is, again, localized into French. Thanks to "follerec" for the heads-up. (Version 1.1)
RAINER BROCKERHOFF Can you email me with specific examples about this? Here for me, Exposé needs only one click. (Version 1.1)
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Dec 9 2008
BGW I installed Klicko to tame the "Click through" beast. Did indeed. However, there was a side effect. In some instances clicking on a dialog box button no longer worked; now a command-click was required. (Version 1.0.1)
RAINER BROCKERHOFF The latest build (the version number hasn't changed) fixes the issue with dialog boxes and palette windows. There's still some remaining oddities but I'm working on them. (Version 1.0.1)