How can you have a "dialog complete" and at the same time
asking for a synch between what?

You are stretching my patience.

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You can have a window, document, script etc. complete.

Once you are talking dialog,
I expected dialog handling complete attempt code.

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Your are pushing MS publishing commonalities here.

This is what you are looking for:

in the main page:
var myReturnValue = window.showModalDialog(strURL, window, strFeatures)
if (myReturnValue == 'OK')
{   
  __doPostBack('', '')
}

in the dialog window:
window.returnValue='OK';