As I understand from the documentation, the default=true setting should force this to be the opening window. But evidently I have overlooked something because the settings that I define donot have any effect.
The hsviewer ignores presentation settings. See http://forums.java.net/jive/thread.jspa?messageID=226450.
This is unfortunate of course. But hsviewer is just a demo app and the source code is available in demos/src/sunw/demo/jhdemo, so it can be fixed if you want to.