Masks Used in the OPEN_REQ Message
Unified CCX can provide much more real-time data than the typical client needs. Apply message masks to suppress (mask) the transmission of unneeded data and thereby avoid wasting network bandwidth.
The network impact of the expected number of simultaneously connected clients must be carefully considered before deploying a client application that unmasks a large number of messages.
Within the OPEN_REQ message, there are four separate mask types for selecting the type of messages wanted and filtering out (masking) unwanted messages: