workbook
you are working on. A workbook contains
worksheets
or
spreadsheets.
Each workbook can contain up to 255 spreadsheets.
To the right you have three buttons:
Minimize
If clicked, this button will shrink the window into an
icon on the
taskbar.
Maximize
which has two states: This button will maximize the window to the entire screen. This button will shrink the window back to its original size.
Close
If clicked this button will close Microsoft Excel.