communication between 3 pic16f877

Hi there,i am doing a project regarding this pic16f877 .i have this let's say B board to display the information of either one of them (A or C).the method i use is via serin and serout .I have a switch which to switch between A or C when i switch it to A position (enable some port) then B will display the information of A (variable byte speed,time etc) and vice versa .how to send and store the serial input from another pic? i use EEPROM to store it and read from there for the LCD display update.Thanks.Anyone know how to actually do this ?thanks for any guidance and help. :-)