The current version of the Citrix ICA client (Online Plugin 12.0) no longer supports the Program Neighborhood, as my colleague Jeroen Tielen has wrote in the following article http://www.peppercrew.nl/?p=563
Some customers are still using implementations that will need the Program Neighborhood client. One customer was using an old version of the ICA client to connect to an remote Presentation Server Farm. The version of the ICA client that the customer was using did not support XML-browsing over https. The new configuration of the remote Presentation Server Farm aspects that XML browsing is done across https, so the customer is needing an newer version of the ICA client, but not the newest as the remote Citrix Farm does not have a Citrix Web Interface in place.
The Citrix client download site only holds the latest version of the ICA client. There is no history on this site . The site http://www.xenappblog.com/downloads/?category=2 does contain download links for older versions. Here you can download the latest version of the ICA client that still contains the Program Neighborhood (version 11.0, Citrix XenApp Plugin for Hosted Apps)