Paul -
Here is more detailed explanation of our Push mechanism:
ol
liPush is sent to an appropriate app on specific device. In this moment it is called deviceID (or apple uuid) in our documentation./li
liApp on the device upon starting always updates/register own record in our database through REST, respectively we always send out a push at appropriate address./li
liIf you need (in your custom process of app development) to send Push regardless of the app installation, based on some id, and this id shouldn't be changed -- you will need to add custom record in your Devices collection and update this record with REST service (you can generate this id, or use a coded value - its up to you)./li
/ol
Or sent Push based on a token, in this case push will be sent to several apps simultaneously.