The network driver provides the Enable and Disable functions to allow Windows to enable and disable the driver. The Enable function prepares the system and network software for operation; the Disable function restores the system and software to its previous configuration. For example, the Enable function hooks the interrupt, and the Disable function removes the hook.
Windows calls Enable when first loading the driver. Standard-mode Windows calls Disable when switching to a non-Windows application, and it calls Enable when switching back from the non-Windows application. Finally, Windows calls Disable when terminating itself. This final call to Disable occurs before Windows calls the driver's WEP function.