When you connect your Spark Core to the Cloud for the first time, it will be associated with your account, and only you will have permission to control your Spark Core—using your access token.
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If you need to transfer ownership of the core to another user, the easiest way is to simply log into the [http://www.spark.io/build Spark build site], click on the 'cores' drawer on the bottom left, and then click the small 'right arrow' by the core you want to release, then click "Remove Core". This will make it possible for the other person you are transfering the core to, to go through the normal claiming process.
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In the future, you will be able to provision access to your Spark Core to other accounts and to third-party app developers; however, these features are not yet available.