An application calls ct_cmd_props to set, retrieve, or clear command structure properties.
Command-structure properties determine aspects of Client-Library behavior at the command-structure level. For example, the CS_HIDDEN_KEYS property determines whether or not Client-Library exposes any hidden keys that are returned as part of a result set.
firstapp.c sets no command-structure properties; instead, it uses the default command-level behavior. Command structures inherit default property values from their parent connection.
For a complete list of command-structure properties, see the ct_cmd_props reference page in the Open Client Client-Library/C Reference Manual.