program window

noun
UK /ˈprəʊ.ɡræm ˈwɪn.dəʊ/
US /ˈproʊ.ɡræm ˈwɪn.doʊ/

A program window is the box on a computer screen where you see and use a program.

I clicked the X to close the program window.


OTHER MEANINGS

2. A framed area on a screen that shows a document or file opened by a program.

The text editor opened a new program window for my story.

3. A separate viewing area created by a running application on a graphical display.

She moved the program window to the side so she could see both at once.

4. The main display panel of a software application, containing menus and tools.

The program window has a menu bar at the top.