MASTER and SLAVE using SPI in Oshonsoft.

Hi,
I'm trying to get two PICs to be MASTER (18F4620) and SLAVE (18F4431).
I use SPI for communication.
I have the MASTER setup ok, and have added a Chip select C/S to both PICs.
I'm now trying to set up the SLAVE. Here is a link for information: https://openlabpro.com/guide/spi-module-in-pic18f4550/
Any help welcome.

Camerart.