User`s guide

lxxxiv Contents
Asynchronous Mode
When asynchronous mode is enabled by calling WinHLLAPIAsync, the function initiates close
intercept and immediately returns control to your Windows HLLAPI application. This frees your
application to perform other tasks while waiting for close requests.
Because asynchronous mode returns control immediately, you must use Windows version 3.x message
notification to determine when close requests have occurred. Use the RegisterWindowsMessage( )
function to register the message “WinHLLAPIAsync”. See WinHLLAPIAsync in Chapter 4 for
details.