How to display a blob in a new window (without saving as file)

Hi,
I have been using the excellent as_pdf3 PLSql utility to create a pdf at run time. The result works great if I save the blob to file, however, I don't want to clutter up the "server", so I would like to send the blob down to the user by opening a new window (pdf reader) and then give the user the option to save where they wish.
I am running Apex 4.1.1, Oracle 11GXE with Apex Listener under Glassfish opensource on Ubuntu Server 11.2.
I've hunted left right and centre, and either I've not got the correct combination of words in the search, or the question has never been raised.
Can anyone give me some pointers and/or code to assist ?

I will try this when I get back home - travelling at the moment.
A bit more background....... I have a Function that is called to produce a yearly calendar view of rentals for a home, along with the rental prices - this has already been written using the as_pdf3 package, which can either physically create the report on the server (using utl_file), or it can return the blob direct.
On the screen, the user can select the years that they wish to see in the report, push a button which will pass the parameters into the above said function, and then launch the "blob" in another window (as the blob is PDF format, it would launch the users PDF reader) - if the user then wants to save the report, they can do (using PDF reader) - this avoids me a) saving and housekeeping a file(s) on the server, b) I don't have to enable utl_file for the schema

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