mzcli is a command line interface (CLI) that you can use to execute system commands independently on multiple hosts.
The mzcli client consists of a jar file called mzcli.jar that you can download from the Downloads dialog that you open from the User Settings menu in Desktop, see User Settings (4.0), and clicking on the mzcli.jar file.
You can use mzcli on any computer with Java installed that has HTTP connectivity to the platform, see System Requirements - Private Cloud(4.0) for information on supported Java versions.