1. A computer-readable medium storing computer-executable instructions that, when executed, cause a computer system to perform a method of providing contextual information automatically, the method comprising: receiving a Session Initiation Protocol message initiating an instant message conversation, the message containing an indication of contextual information in a header field of the message, the indication automatically added to the message when a first user initiates the conversation in association with the indicated contextual information; decoding the indication to determine an identifier for the contextual information; and providing a command to a second user for loading the contextual information indicated by the received message.