Synker FAQ

This allows Synker to read the sync settings, such as whether sync is enabled for Contacts.

This allows Synker to read the history of syncs that have occurred. This is used in the Accounts and Sync Inspector for advanced sync information.

This allows Synker to modify the sync settings, such as whether sync is enabled for Contacts.

 
Synker will provide control over non-user facing sync adapters, such as this one. We surmise that "push subscriptions" are utilized by Google’s push notification service that is available to Android developers.
http://android-developers.blogspot.com/2010/05/android-cloud-to-device-messaging.html