the name of the property to get.
If null or SESSION_PROP_ISALIVE property name is specified,
then this will return "true" if session is alive, otherwise
"false" or an FME Server exception will occur.
If SESSION_PROP_SERVERBUILDVERSION property name is specified,
then this will return the build string of the connected FME Server.
If SESSION_PROP_SERVERLOCALE property name is specified,
then this will return the locale string of the connected FME Server.
If SESSION_PROP_SECURITYLOGINTYPE property name is specified,
then this will return the security login type of the connected FME Server.