A data communication system includes a centralized server arrangement coupled via a communication network arrangement to a plurality of client devices. The centralized server arrangement and the plurality of client devices exchange data. The system allocates the data into a primary type of data and at least a secondary type of data. The primary data is communicated substantially immediately within the system, and at least the secondary data is communicated in the system in association with corresponding acknowledgements (ACK) in response to receipt of the second type of data at one or more of the client devices. At least one of the one or more client devices is optionally a wireless-enabled mobile communication device or a wirelessly-connected personal computer (PC).