Getting RDP properties using powershell or vbs

Hi,

I would like to make a script which starts up when logging on to an RDP session. In this script I would like to get RDP properties that were defined in the rdpfile that the client used to make the RDP connection. alternateshellname or remoteapplicationname in particular. How is this information passed to the RD server (windows server 2012) and how can it be read by a script?

Thanks in advance!