File moving hell on Windows

I'm dealing with a Windows NT network that includes some digital printing presses that also run Windows. PHP 5.3.8 is running on one NT machine. Its job is to take CSV files that exist in a directory on one machine, and move them to a directory on the digital presses. All the source and destination folders require different network credentials to read and write -- and because of red tape bureaucracy, that cannot be changed. Any suggestions how I could do this? I can't find any file-move examples that include the use of network credentials with each read and write. Thanks... :-(