Can i use TX pin or pin 4 on Arduino Ethernet?

Hello, i want to connect a LCD and a barcode scanner in the arduino ethernet but i don't have avaiable pins.Can i connect LCD pin to the TX pin or pin 4 if i don't use the serial port and the sd-card??

please help..

I think the answer is YES to both. Also remember that A0-A5 can act as digital I/O pins.

thanks a lot..i tried it again and it works..