When you double click Go To Related Records in the script editor, you get a dialog where "new window" is an option controlled by a check box. Clear this check box and the step will not open a new window when it executes.
Thanks for the prompt reply. What I need the script to do is to call up the existing Client Detail window which is separate from the Client List window. Is that doable? Thanks again.
Yes, use select window to select the client detail window, then the next script step can be Go To Related Record--without the new window option.