WinXP, Visual Studio 2003 I have a dialog based application which consists of the main thread and a data collection thread. The main thread updates a graph from data read by the data collection thread. I want to use an object, which is of type MyData to share the data between the threads. So , basically the data collection thread which collects data from a piece of hardware and places it in the MyData object, then the main thread reads from the MyData object and updates the graph. After reading a bit on shared memory, managed mapped memory etc. in Boost, I am a bit confused on how to do this. What is the best boost classes to use for this? Will I also need a sync object to synchronize the threads? Thanks, Ed