I know in unix and linux we can active window by hovering mouse on it,and I found Windows 7 and Vista also has this feature.
1.Go to Control Panel, and click Ease of Access Center
2.Scroll down and click Make mouse easier to use
3.Scroll down and find Activate a window by hovering over it with the mouse ,then check the checkbox
4.Click Apply to enable active window by hovering mouse.
5.(Optional)If you feel the delay of activing window is too long,you can open your Registry Editor ,then brower to
Then in the right pane,double-click ActiveWndTrackTimeout ,then change the Base to Decimal,then set the value to a
lower value,eg:100 or 50 or o
6.(Optional)If you just want to active the window but not bring it in front,go to the same location of Registry in step 5,in the right pane,double-click UserPreferencesMask and change it’s value to 9f 3e 07 80 12 00 00 00
Note:For step 5 and 6 logoff is required.You can download below registy hack file to enable both step5 and step 6 (Change delay time to 100,and only active window but not bring it to front)