Main Window contains the menu bar, the tools bar, the status bar and the task list.
You may create, edit and delete a task in the main window, and you may control a task to start, stop and run now.
The task list displays task name, run status, last run time, next run time, task type and task schedule.
When the main window is minimized, it will place a icon to system tray. You may click the icon and pop up the main window again.
You may right-click the icon and pop up the menu.
