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In addition to what Karl said, as of BuildMaster v3.1 we have made agents extensible.
As an example, we now offer an SSH-based agent that uses the SFTP protocol to communicate with a remote server, instead of the traditional SOAP channel. This means that nothing needs to be installed on the remote server, and because agents are extensible, you or we could develop, for example, a Powershell or FTP-based agent.