The hpcpack is a command that is used in Windows HPC Server 2008 R2 (SP1 currently) to create deployment packages that are installed in Azure worker nodes.
With the hpcpack you can create a .zip file that contains the content you wish to deploy, upload the package to the Azure storage where all HPC application packages are stored (it is a special blob created for that matter), and sync the Azure worker nodes with the new uploaded applications.
The main problem with finding documentation about the hpcpack command is that searching hpcpack on the Internet usually produce search result for the Microsoft HPC Pack 2008 R2 instead of the hpcpack command.
So here’s a direct link to the TechNet documentation about this command:
I hope this post helped those of you searching for the hpcpack command.