in Platform/Tools/PowerShell/JetCmdlet/Infra/TeamCity/TeamCityProperties.cs [47:55]
public string GetSystemProperty([NotNull] string name)
{
if(name == null)
throw new ArgumentNullException("name");
name = Regex.Replace(name, @"^system\.", "", RegexOptions.IgnoreCase); // Props are listed without the "system." prefix in the file
AssertIsRunningInTeamCity();
TryLoadSystemPropertiesFile();
return mySystemProperties.GetValue(name, string.Format("The system property {0} is not defined.", name.QuoteIfNeeded()));
}