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# (Windows) Using an External Web Server for Multiple
Stand-Alone Instances of OpenText PPM

Because of Windows registry limitations, you cannot use just one Web server for multiple stand-alone OpenText PPM instances on a machine running Windows. Integration with an external Web server involves specifying the worker_file registry directive that points to the `workers.properties` file. The `workers.properties` file tells the redirector (`isapi_redirect.dll`) where to forward the request. Redirecting to two different instances does not work because each instance requires different workers properties. However, a single Windows registry points to only one `workers.properties` file.

If you must use an external Web server for multiple stand-alone PPM Server instances, we recommend that you either use a UNIX machine to host the Web server, or use a hardware load balancer.

https://admhelp.microfocus.com PPM 8942
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