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Wiznet has published example software, e.g. for AVR and STM32. You can use it as a template for your PIC18 design, just replacing the low level SPI routines. For the hardware setup, you just need to know the SPI mode and supported clock speed.
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I just saw that Microchip has a W5200 PICtail, to be used among others with PIC18 development boards. So there's probably readymade software from Microchip.