WinHLLAPIIsBlocking

This function tells the calling WinHLLAPI application thread whether it is in the process of executing a blocking call. A blocking call is any synchronous function that takes a long time to execute and does not return until complete. There are five blocking calls in this implementation of WinHLLAPI. The blocking calls are: Get Key (51), Wait (4), Pause (18), Send File (90), and Receive File (91).