I have disabled the notification area or system tray in Windows 7 using group police (gpedit.msc). Now all notification icons are gone. Now I want to access some application which Minimize to system tray. Is there any way to access those minimized program without re-enable the notification area?
Look into opening the Task Manager » Applications/Processes and look for the program. Try opening the program through this.
Have you tried running the app again? Many apps that do not allow multiple instances will simply bring to front/maximise/focus the existing app window/running instance if run again (for example uTorrent behaves this way unless /recover is specified as a command-line argument).