I use notepad and often open multiple instances of it. Is there a way to close all instances of it in a single click ?
Closing them one at a is a real pain.
( I do not like to use notepad++ )
You can create a shortcut with command
taskkill.exe /im notepad.exe
If you have the "Group similar task bar buttons" option (Start > Properties > Taskbar) checked, then you should be able to right click on the Notepad group in the taskbar and close all instances of the application.
Settings -> Preferences -> MISC. There find the option called "Remember current session for next launch" and uncheck it.