Sets the time between ticks for idle tasks
BOOL SetTickPeriod( long lMillisecs );
The new value of the period in milliseconds. See remarks below.
The function returns TRUE if the function succeeds, FALSE for failure.
Sometimes updates cannot be sent immediately to Excel, because the application is busy, or the user interface is in use. The push engine will try again within TickPeriod milliseconds.
This function may only be called from the main thread.