dealing with dynamic amazon server

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http://serverfault.com – I have a VM on amazon, each day when I start it it givies me a new ip like ec2-123-45-67-89.compute-1.amazonaws.com Its a window based machine. I want to install some s/w on that VM so that I dont need to remember that dynamic ip again and again for accessing via remote-desktop software and browsing urls. Is there any free server dealing with that? (HowTos)