Reading data form Parallax GPS

I've connected my gps and arduino like shown in this Tutorial. It works perfectly and gives me all information. But i need only few parameters. I've read in gps manual that it is possible to get info from gps by sending commands to it. The problem is that gps module is using the same wire to send and receive information. Can i connect the same wire to RX(0) and TX(1) pins ?

The GPS is using TTL levels so you can use a digital pin ans software serial.

i still don't understand :). Should i connect wire form SIO to 2 and 3 pin on my arduino and in program write

AFSoftSerial mySerial =  AFSoftSerial(2, 3);

or connect SIO to pin 2 and write AFSoftSerial mySerial =  AFSoftSerial(2, 2);

the easiest thing to do is just ignore the extra data. You can also write some serial code that waits for the string you want. If you want $GPRMC, you wait for that and then stop reading serial.

I think poster #2 was saying you could use Software serial to send the GPS config commands. Lots of work...