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You can always just set a timer and call your server once every few seconds to check for updates. It really depends on how vital/compex/reusable you need that code to be, as to how important it is to introduce the complexity and cost of FDS.
Another option might be to look into BlazeDS which do real-time data push. It is now open source which makes it an economically reasonable solution. To use BlazeDS, you will need Tomcat 6, JBOSS, Web Sphere or some other J2EE aplication server. Although the timer method is simpler to implement, BlazeDS is more powerful.
I agree with Masamune. I got to see a demo of BlazeDS at Flex Camp it it is pretty sweet stuff!
BlazeDS comes with Tomcat. If your operation is small (ie, 2 computers) that would be fine.