User`s guide

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Once enabled, Host notification is enabled until you call Stop Host Notification (function 25).
Once you call this function, you can use Pause (function 18) to notify your Windows HLLAPI
application when the presentation space and/or OIA of a Host session have been updated. Use Query
Host Update (function 24) to determine which parts of the Host session (presentation space, OIA, or
both) have been updated.
Asynchronous Mode
When asynchronous mode is enabled by calling WinHLLAPIAsync, the function initiates host
notification and immediately returns control to your Windows HLLAPI application. This frees your
application to perform other tasks while waiting for host updates.
Because asynchronous mode returns control immediately, you must use Windows version 3.x message
notification to determine when host updates have occurred. Use the RegisterWindowsMessage( )
function to register the message “WinHLLAPIAsync”. See WinHLLAPIAsync in Chapter 4 for
details.
Remarks