Not all systems have an application-readable globally unique IDs, so we use a different approach to host identification. When a host first contacts the scheduling server it is assigned a host ID. The server also maintains an RPC sequence number for each host. Both the host Id and the RPC sequence number are stored in the client's client_state.xml file.

If the scheduling server receives an RPC with a sequence number less than the expected sequence number, it creates a new host record in the database. (This might happen, for example, if a user copies the client_state.xml file between hosts.)

Merging duplicate host records

This mechanism can lead to situations where the server has multiple host records for a single host. The user can merge these to a single record using the Merge hosts command on the web interface. "; page_tail(); ?>