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The applet already had functionality to open PDF documents passed to it as parameters, but this provides the ability to open a PDF file in a specified viewer, on any operating system, with a single URL.
For example: http://bfo.co.uk/pdfviewer.html?pdf=http://bfo.co.uk/products/pdf/docs/userguide.pdf&feature.Menus=false
What would be more useful is if this was integrated into your browser so that you can open any links to PDF documents directly in the PDF Viewer - which is what the Firefox extension that I have written does: any link on a page that ends in .pdf will have an extra "Open link in PDF Viewer" context menu option.
Choosing this menu option will open the PDF document in a separate browser window that contains the PDF Viewer applet. You can install the Firefox extension from here: http://bfo.co.uk/bfopdfviewer.xpi
Obviously having Java 6 Update 10 or later makes the applet experience better, although we are specifying that each applet instance runs in its own JVM instance, which might slow down the applet startup a little, but is important for coping with larger PDF documents.
* I know Java requires a JVM installation - but I picked up this bit of marketing bollocks from the early days of Altio and figure desktop Java needs all the help it can get these days :-)