How to process information from Ethercard

Using Arduino Networking, Protocols, and Devices
4

This:

  SoftwareSerial RFID = SoftwareSerial(rxPin,txPin); 
  RFID.begin(2400);

does not belong in loop(). Why create a new instance of SoftwareSerial on every pass through loop()?

The contents of the page is only 1234 and I would like to put it into an variable which I can compare.

1234 what? Did you mean "1234"?

If so, explain this:

byte Ethernet::buffer[700];

buffer is a variable, and you can compare the contents to other stuff, using the appropriate function.