Citrix Receiver 4.2 & PNAgent Configuration

There is an undocumented regkey setting required to add PNAgent functionality using the new Citrix Receiver 4.2.

[HKEY_LOCAL_MACHINESOFTWARECitrixDazzle]
"PnaSSONEnabled"="true"

Once applied the Citrix Receiver 4.2 can utilise a PNAgent/config.xml configuration. Source