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Looking at various versions of my compiled code I see that the C for the LCD contain these lines:-

void FCD_LCDDisplay0_GetDefines()
{
} //Dummy end of function to allow defines to be added correctly
//component connections
#define LCD_4129482_PORT portb

In other versions the long number in middle is different such as:-

#define LCD_328348_PORT portb

#define LCD_1835698_PORT portb

What is the significance of this number? Why does it vary maybe every time I compile and do I need to worry about it changing?

Hello

This is just a method we used here to allow multiple LCDs to be added to a program without causing problems. The number is random and you do not have to worry about it changing.