uC for PIC compiler V6.2 writting firmware problems

Hi!everybody.Please somebody answer to my following questions that I
can not find answers for them even in uC manual,(I use PIC 18f452 and
uC for PIC compiler V6.2 );

1.I want to write a program and use only one pin of my PIC port for example;pin2 of PORTC, so in uC for PIC compiler V6.2 what I write for that,is it right if I write RC2?

2.I want to display an input measured voltage on the LCD with the format of " mmm.nnn " so in uC for PIC compiler V6.2 what I write for
that?

3.In the uC for PIC compiler V6.2 manual there is a LCD library for 4-bit
interface but it is not clear that is work for HD44780 LCD driver or not
and support the;" 2x16 o, 2x20 ,4x20 or...which of them? And how the user must define it?

4.I want to use external interrupts; INT0, INT1 and INT2;when
a high to low pulse trigger injected individually to them ,that is unpredictable they act with the priority of;
1.INT0 then 2.INT1 and finally INT2. In uC for PIC compiler V6.2 what I write for them?

Thanks,
bobx