A software application or resource is enabled to participate in a messaging service session conducted over a network and to respond to plain language queries much like a live participant. The software resource registers with a messaging service server when the software resource is initially executed, making it available if included in a user's list of contacts, to be added as a participant. During a messaging service session, a user can direct a message or query to the software resource that is participating. The software resource parses the query, and if the query is understood and data are available, transmits a response that appears within the instant message dialogue window of the users participating in the messaging service session.