How to interrupt in microcontroller? Answered

I need your help in my graduation project It is a smart home project in which i am using two PIC micro-controllers PIC16f877A for LCD & Keypad which is a way of devices control connected to the main micro PIC18f4550 i have problems in main micro code could you help me please


I am trying to achieve multi way home automation with some security like fire system and recording camera .
one micro for lcd and keypad connection.
another to handle interrupts coming from different ways of devices control like keypad , GSM messages serially connected , C# windows application USB connected and remote.

my code
https://drive.google.com/open?id=0B7jw0zvYc42cdmJPbGRzOWQ0MW8&authuser=0