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To close the chats, you can pick up the Chat Head and throw it away at the bottom. Or pick the whole group of messages and do the same.
Go to the Google Play store to install the app. You can install it one time only, or make it a more permanent fixture.
HTC One, One X, and X+ along with the Galaxy S3, S4, and Galaxy Note 2 will be among the first phones to support. The idea is to start off slow. It will be available for download on April 12.