Abstract: A system and method of managing data communication over platform-level interconnect protocols may include receiving first and second requests from a source device, each optionally querying data from a destination device, encapsulating the requests as payload and tunnelling them as respective posted messages via a platform-level interconnect protocol. Embodiments may further include transmitting corresponding non-posted messages, triggered by the posted messages, obtaining queried data pertaining to the first request, and encapsulating the queried data as payload and tunnelling it to a sink device as a completion message associated with the second non-posted message. Embodiments may include a pro forma counter configured to increment upon transmission of each non-posted message and decrement upon reception of each completion message, thereby enabling retrieval of queried data while managing outstanding non-posted message limitations of the platform-level interconnect protocol.