Network Button in Standard Open/Save Dialog

I am writing my own Open file dialog, and would like to
provide a 'Network' button like the standard Open
Dialog does. Is there an API call that will tell me
if the button need's to be displayed, and if so, how
do i go about bringing up the Windows 'Add Connection'
dialog if the user clicks on the button.

I am using Delphi 1.

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   Richard Hosking, BSC (Hons) Software Eng, Year 2
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