The following sections describe the queues that are established when your Windchill solution is installed. When optional products are installed, additional queues can be established. These queues are described as part of the product description. For example, the queues used for file vaulting are described in Out-of-the-box Background Queues for External Vaulting and the queues used for content replication are described in Out-of-the-box Background Queues for Replication.