The playerControllerId of the player that is rejoining.
The HLAPI treats players and clients as separate GameObjects. In most cases, there is a single player for each client, but in some situations (for example, when there are multiple controllers connected to a console system) there might be multiple player GameObjects for a single connection. When there are multiple players for a single connection, use the playerControllerId property to tell them apart. This is an identifier that is scoped to the connection, so that it maps to the id of the controller associated with the player on that client.
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