How could a Citrix Administrator add a XenApp 6.5 deployment to a XenDesktop 7.6 deployment so that both are manageable from within Citrix Director?

DirectorConfig.exe is the command-line configuration utility installed with Citrix Director that allows administrators to set Director parameters, including adding legacy XenApp 6.5 farms by specifying the Data Collector address. Running this tool on the Director server updates the necessary configuration so that both the XenApp 6.5 and XenDesktop 7.6 environments are visible and manageable from a single Director console.

A dedicated Director server for XenApp 6.5 is unnecessary because a single Director instance can manage both environments once properly configured.

Citrix Director does not rely on registry entries for farm discovery; this is not a supported or documented configuration method.

The service.AutoDiscoveryAddress setting in IIS is used for Director's auto-discovery of XenDesktop sites, not for adding legacy XenApp 6.5 farms, which requires the DirectorConfig.exe tool.