Configure Special Window Settings & Configure Special Application Settings

[ProtonMan]

I would like to know what the actual difference is between Configure Special Window Settings and Configure Special Application Settings, cause when I bring them up they look the same to me and if I have added something in one it’s in the other.

[dusoft]

Application is for any windows in that app and windows is only for that window.

[johnandmegh]

For what it’s worth, some additional background on this topic was linked to here:

Window class (application) versus whole window class for KWin rules?

An application can have many windows and each instance of application window can have special name (that can differ from other instance names). So when a rule only checks application class, it applies to all window instances of the application. If you select Whole Window Class then you can target a specific window class instance of application. If you are interested into background details, this comes from InterClient Communication Conventions Manual (ICCCM) - WM_CLASS Property.