title: Communication between parallel batch files
body: <p>I have a batch file, 'buildAll.bat', that builds a set of projects. It will be called by another batch file, 'manager.bat'. The 'buildAll.bat' job executes in another window and outputs a lot of text. 
  I want the progress of the build job to be displayed in the original window('manager.bat'), like this:</p>
  
  <p>Building project 1...done.
  Building project 2...done.
  Building project 3...done.
  ...
  Build completed.</p>
  
  <p>How can the build progress be communicated between the two jobs ?</p>