The SUNIX LPT Port Windows driver is a software package used to support and enable communication between the computer's operating system and a parallel port (LPT port) provided by a SUNIX parallel port controller. SUNIX is a manufacturer of I/O cards and peripheral devices, and their LPT (Line Printer Terminal) controller cards are commonly used to add or manage parallel port connections in desktop computers or servers.

The LPT port is an older technology primarily used to connect devices like printers, scanners, and other peripherals that require a parallel communication interface. Since many modern computers no longer include parallel ports, such cards and drivers may still be relevant for legacy devices that use the LPT interface.