There are three distinct types of messaging events planned Random queries will be sent at a rate of 4 per day during normal waking hours for that participant, as recommended by the leading Ecological Momentary Assessment (EMA) researchers. The second type is a medication dose reminder, which for most patients will occur once or twice per day with current ART medication regimens. The third type is an event-contingent message, which the PARTICIPANT initiates, for events like drug craving, drug use, etc. Therefore, most participants will receive 5 or maybe 6 messages per day from the system, and may send 1-2 messages confirming taking their medications, or may send us more messages if they report a critical event.