Windows keys

win :-
      Windows symbol key is used to open the "Start Menu".

win+D :-
        This key is used to minimize all currently open applications/windows explorer . Press it again the current using applications/windows explorer will open.

win+ctrl+F :-
        These keys are used to open search for Network Computers Dialog Box.

win+E :-
        These keys are used to open a windows explorer file browser.

win+TAB :-
        These keys are used to cyclic the currently opened applications.

win+shift+tab :-
         These keys are used to view in cycle through programs in the taskbar in reverse order.


win+F :-
        These keys are used to open a search window to search files.

win+F1 :-
        These keys are used to open up the Microsoft Help and Support center window.

win+R :-
         These keys are used to open a run dialogue box.

win+L :-
         These keys are used to Log off  from the current user.

win+M :-
         These keys are only used to minimize the current applications.

win+shift+M :-
         These keys are used to Maximize the currently minimize application.

win+U :-
        These keys are used to run utility manager and narrator voice.

win+Break :- 
        These keys are used to display the system properties.      

NOTE :- When you are using the above windows keys and others keys, you should press both/more keys at the same time.You couldn't press/use the "+" key.
               "win" means windows key. This key is available with widows symbol in the keyboard.