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Roger,
what is the function does: DCREAD GUI PARENT @oDlg ?
what is the function does: DCREAD GUI PARENT oDlg ?
Both of these commands work but the behavior of the program is not the same.

.. PARENT @oDialog is used when DCREAD GUI automatically creates the dialog window for you, which is almost always.
@oDialog is used to create a pass-by-reference pointer to store a variable to the DC_XbpDialog1() object for use later in the program.

If you don't use @oDialog, but use only oDialog, then DCREAD GUI is expecting that you already have a pointer to a dialog window that will be used for all the DC* objects that will be created.

This may sound complicated to you but it really isn't as long as you always let DCREAD GUI create your dialog window.
As a habit, you can use DCREAD GUI PARENT @oDialog all the time, but then you should have LOCAL oDialog at the beginning of the function.

Thanks Roger,
now everything is clear.