There is a problem when developing and using ISAPI Extensions for MS IIS coming from the fact, that there is no IIS command to unload a single loaded extension. This way each time you have to exchange your extension for reasons of bug fixing or enhancing you will have to down the server und then to restart. While this might be no problem in an intranet where you can access the server directly it is very combersum if you are not the network manager or if your server is at your provider. ISAPI Manager solves the problem by installing an intermediate link library which calls your library in turn. This way it is the ISAPI Manager library that is sticked into IIS and not your library. ISAPI Manager provides commands to load and unload your ISAPI extension on command.