LLMessageSystem msg; // Add a UUID for the avatar "Bob" LLUUID bobUUID = LLUUID::generateNewID(); msg.addUUID("AgentID", bobUUID); // Add a UUID for a prim object that "Bob" is holding LLUUID primUUID = LLUUID::generateNewID(); msg.addUUID("LocalID", primUUID);In this example, two UUIDs are added to the message using the "addUUID" method. The first UUID is for the avatar "Bob", and the second UUID is for a prim object that "Bob" is holding. Package library: Second Life Viewer SDK (LLMessageSystem is a part of this SDK)