User`s guide

lxxxviii Contents
If position 2 of Data String is “D,” only AID keystrokes are intercepted. All other keystrokes are
passed on to the appropriate Host session presentation space.
Asynchronous Mode
When asynchronous mode is enabled by calling WinHLLAPIAsync, the function initiates keystroke
intercept and immediately returns control to your Windows HLLAPI application. This frees your
application to perform other tasks while waiting for keystrokes.
Because asynchronous mode returns control immediately, you must use Windows version 3.x message
notification to determine when keystrokes have occurred. Use the RegisterWindowsMessage( )
function to register the message “WinHLLAPIAsync”. See WinHLLAPIAsync in Chapter 4 for
details.