# Port

**For UNIX:** Port is not always the same as the physical
device, and can be thought of as the D3 port number.

**For Windows:** A port is the number of the serial
device attached to the hardware. Many commands, such as logon and set-baud, reference a port by its number.

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Source: https://d3codex.com/definitions/port/ - part of the D3Codex reference.