DLL Callback

This sample demonstrates the use of asyncronous inner-process operations. In this case we have an app that wants to get data from a DB, which could take a undefined long amount of time. The app wants to do other work while waiting for the result of the DB-Call. It calls the "GetDBData()"-function, which returns immediately. After the DLL-function has done its work, it notifies the caller app via the CALLBACK-function "DataReadNotify()".