which is used to see the contents of window
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Answer:
In computing, a window is a graphical control element. It consists of a visual area containing some of the graphical user interface of the program it belongs to and is framed by a window decoration. It usually has a rectangular shape[1] that can overlap with the area of other windows. It displays the output of and may allow input to one or more processes.
Windows are primarily associated with graphical displays, where they can be manipulated with a pointer by employing some kind of pointing device. Text-only displays can also support windowing, as a way to maintain multiple independent display areas, such as multiple buffers in Emacs. Text windows are usually controlled by keyboard, though some also respond to the mouse.
A graphical user interface (GUI) using windows as one of its main "metaphors" is called a windowing system, whose main components are the display server and the window manager.
ᴡɪɴᴅᴏᴡs ᴀʀᴇ ᴜsᴇᴅ ʙʏ ᴍᴏsᴛ ᴀᴘᴘʟɪᴄᴀᴛɪᴏɴs ᴀs ᴡᴇʟʟ ᴀs ᴛʜᴇ ᴏᴘᴇʀᴀᴛɪɴɢ sʏsᴛᴇᴍ ɪᴛsᴇʟғ. ᴀ ᴛʏᴘɪᴄᴀʟ ᴡɪɴᴅᴏᴡ ɪɴᴄʟᴜᴅᴇs ᴀ ᴛɪᴛʟᴇ ʙᴀʀ ᴀʟᴏɴɢ ᴛʜᴇ ᴛᴏᴘ ᴛʜᴀᴛ ᴅᴇsᴄʀɪʙᴇs ᴛʜᴇ ᴄᴏɴᴛᴇɴᴛs ᴏғ ᴛʜᴇ ᴡɪɴᴅᴏᴡ, ғᴏʟʟᴏᴡᴇᴅ ʙʏ ᴀ ᴛᴏᴏʟʙᴀʀ ᴛʜᴀᴛ ᴄᴏɴᴛᴀɪɴs ᴜsᴇʀ ɪɴᴛᴇʀғᴀᴄᴇ ʙᴜᴛᴛᴏɴs. ᴍᴏsᴛ ᴏғ ᴛʜᴇ ᴡɪɴᴅᴏᴡ's ʀᴇᴍᴀɪɴɪɴɢ ᴀʀᴇᴀ ɪs ᴜsᴇᴅ ᴛᴏ ᴅɪsᴘʟᴀʏ ᴛʜᴇ ᴄᴏɴᴛᴇɴᴛ.