Which messages are not sent in response to a specific query from a user or an application?

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Unsolicited messages are those that are sent without receiving a specific request or query from a user or an application. In the context of healthcare data exchange using HL7 standards, unsolicited messages can include notifications, alerts, or updates that a system sends automatically to inform other systems or users about an event, such as a patient admission or a status update, without any prior request for that information.

These types of messages play a crucial role in maintaining up-to-date information in a health information exchange ecosystem, allowing different systems to remain synchronized without requiring constant queries. This contrasts with solicited messages, which require a request from a user or application before the data is sent, making unsolicited messages essential for efficiency and proactive communication in healthcare settings.