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Short answer: No
To display the network diagram, Webreach needs to poll out some information from the ud folder, located on the IIS server (usually the ION Primary server, but it can be different - see "Deployment of the Web Reach Web Application on a Separate Host from the Primary Server").
In some case, it might be convenient to access the server using a mapped drive instead of the full computer access path on the network.
For example using "Y:" instead of "\\<computer_name>\ION_Ent\". The location "Y:" points directly to the IONEnterprise shared folder on the server. This could be convenient for example to setup a disaster recovery plan.
However, this function is not working. Webreach cannot access the diagram located under "Y:"