A quick overview of the X Protocol

• Clients send “requests” to the X server

• Most requests are asynchronous and sent in batches

• Some are synchronous and require a round-trip to get a response from the X server

• X servers send responses, error messages, and events to clients

• Errors can be sent quite a bit after program finishes call that caused error – can make debugging difficult

  • Errors include sequence id of request that caused them

Notes: