SPI resistors AVR042

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Hello, I am new to the AVR series micros. A novices learning and using BASCOM - AVR. I read the discussion on this site concerning SPI resistors (Google search). Atmels AVR042 bulletin recommends using resistors between the slave device and an ISP programmer on the same hardware SPI bus lines used by AVR to connect to the slave. In some applications they have recommended values as high as 10K. I was wondering what kind of currents do these data lines see? Does anyone know the real skinny on the effect resistors would have on the SPI bus? I know why Atmel recommends them, I don't understand how reistors in the MOSI/MISO lines could inhibit SPI tranfers???Thanks

Just some guy