PRB: Starting MSAA Client as Service Causes WinExplorer Problems

RESOLUTION

When you start a Microsoft Active Accessibility (MSAA) client as a service that uses in-context hooking, you should wait until Windows Explorer has started to install the hook(s). To do this, install an out-of-context hook for EVENT_OBJECT_CREATE using the MSAA SetWinEventHook API and wait until an object with the Shell_TrayWnd class name is created. This indicates that Windows Explorer has been started and that you can safely install your in- context hooks without disabling the Windows Explorer Copy and Paste operations. After you see this event, uninstall the temporary out-of- context hook and install the desired in-context hooks.