Could you check the following porting guide for wiced based solution.
Wifi BT proifle in 4356 do have a coexistence interface build into the firmware.
Read the following blog posts
The coexistence interface make sure to get the maximum efficiency of operation when WiFi BT are working in tandem.
On an application point of view, its upto to the host processor to which the chip is interfaced, to share the information between WiFi and BT activities.