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WebSphere Message Broker Toolkit:
There are three images for the WebSphere Message Broker Toolkit. Each image contains a top-level directory with the name 'diskN', where N is 1, 2, or 3, referring to the CD numbers on which the product can be ordered. All three images are required to make a complete installable image of the Toolkit. For the Toolkit installation to run from a hard disk, you must place each of the 'diskN' directories in the same parent directory.
http://www-01.ibm.com/support/docview.wss?uid=swg24030968