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  4. Quick way to retrieve current screen resolution
Why use the Windows API when you can retrieve the current screen resolution using two simple variables?

Screen.Width
Screen.Height
Above variables will automatically get updated if the screen resolution were to change while the application is running.

MessageDlg(
'screen width = ' + IntToStr( Screen.Width ) +
', screen height = ' + IntToStr( Screen.Height ),
mtInformation, [mbOk], 0 );