pane

noun
1
a single sheet of glass in a window
شیشه پنجره, لنگه شیشه, قطعه شیشه
2
a separate area within a window on a computer screen, in which information of a particular type is shown
بخش پنجره‌ای, بخش
I keep the task pane open as a reminder of the things I need to do.