Synchronous mode is enabled after the Carbon Copy application is installed , and upon reboot the Carbon Copy remote-control driver (ccvideo4.dll) and a Carbon Copy device interceptor (ccdevice.sys) are installed and placed in the chain between the system video driver and the miniport driver. This driver and interceptor intercepts and evaluates the calls passed for processing. During an actual remote-control session , any changes that occur on the screen of the Carbon Copy clients are emulated back to the Carbon Copy console user on a synchronous line by line basis. So essentially, any object that changes on the client is painted simultaneously line by line in the console user's remote-control window.
Asynchronous mode does not utilize any remote-control driver's but interfaces with the Windows GDI. In this manner, blocks from the actual client's desktop are transmitted back to the console user's remote-control window.(64 x 32 default). This block transmission does not occur concurrently with the changes on the clients desktop so the appearance is a slight delay if you were to have the console and the client machine side-by-side.
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