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Networking is the process of connecting computing devices, peripherals and terminals together through a system that uses wiring, cabling or radio waves that enable their users to communicate, share information and interact over distances. Often associated are issues regarding operating systems, hardware and equipment, cloud and virtual networking, protocols, architecture, storage and management.
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Are these in a Active Directory domain? If not, then did you add your user-id/password to the 3rd PC. Meaning, can you logon to that PC directly using the same user-id/password you are attempting to RDP with?