I wouldn't say there's something in the API to handle this kind of thing. You can either store the information in the registry or keep track of it on your own server. The registry is probably the easier method, but then it's only persistent on the one specific device. Channels such as Netflix store the information on their own server so that a user can resume on any supported device. This method requires some kind of account that a user logs into on every device he uses.
-JT
Roku Community Streaming Expert
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