How To Tell a certain window running of which we have the hwnd ... to do things ...

ok i know how to close an application running ,
but what i want is to , once i get the hwnd of a window
to be able to minimize it Maximize it make it invisible
change it s position . any ideas ??

Hope these help

http://www.vbapi.com/ref/s/showwindow.html
http://www.vbapi.com/ref/s/setwindowpos.html
http://www.vbapi.com/ref/m/movewindow.html