Currently, one can post messages to the Zorro window to achieve desired actions:
  • WM_APP+1 causes Zorro to pull market data from the plugin.
  • WM_APP+2 invokes the callback() function.

I would like WM_APP+3 to call a general purpose callback supplied by the plugin.

To do this, Zorro would simply support a new function in the broker API, BrokerCallback(void* Address).