title: Where does TeamCity get the value for %system.teamcity.build.workingDir%
body: <p>We have TeamCity and on the <code>[Runner: Command Line]</code> of the <code>[Build Configuration]</code> page, there is a <code>[Command Parameter]</code> field <code>%system.teamcity.build.workingDir%</code></p>
  
  <p>My question is where does TeamCity get this value from as when i look at the System Properties of the Agent i do not see it has been set. 
  <code>%system.teamcity.build.workingDir%</code> does not appear in the list of <code>[System Properties]</code> or <code>[Environment Variables]</code></p>