owner specifies an owner window for the dialog. See Dialogs: Prompting for Input for details.
is non-nil, then it must be a function with a lambda list that accepts one argument. The
function is called with the values that would normally be returned by
page-setup-dialog. On Cocoa, passing
causes the dialog to be made as a window-modal sheet and
display-dialog returns immediately, leaving the dialog on the screen. The with-dialog-results macro provides a convenient way to create a
CAPI User Guide and Reference Manual (Windows version) - 3 Aug 2017