Fairly Simple really, Under the OSD script Properties Methods and Credentials Just select "Use Muticast" That will then allow you to select the Multicast Domain Rep Discovery Options as well as the Advanced Options for TMC such as how long to Cache the file... Then you just target the 20 machines and start the task. It will choose a Domain Rep copy the image down and then unicast to the others.
Thanks for that, I'm having a new problem however. When I start the tastk, shortly after it fails with the following message:
"multicast server could not access file"
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Your MDR is trying to download the image file from source using the local system account. You need to either add "domain computers" to the image share with at least read access, or configure the share credentials in "Preferred Servers".
See http://community.landesk.com/support/docs/DOC-2304 for more info