This code uses the top level Application object to minimize the main Excel window.

Sub MinimizeExcel()

    Application.WindowState = xlMinimized

End Sub

Sub DisplayExcelVersions()

    MsgBox "The version of Excel is " & Application.Version
    MsgBox "The version of the VBE is " & Application.VBE.Version

End Sub

The use of the Application.Version property is useful for ensuring code only operates on a compatible version of Excel.

Remarks

Excel VBA comes with a comprehensive object model which contains classes and objects that you can use to manipulate any part of the running Excel application. One of the most common objects you'll use is the Application object. This is a top-level catchall that represents the current running instance of Excel. Almost everything that is not connected to a particular Excel workbook is in the Application object.

The Application object, as a top-level object, has literally hundreds of properties, methods, and events which can be used to control every aspect of Excel.