LcdCommandWrite & LCD Questions

I have got my arduino and LCD and have been going through the 8bit tutorial found here:
http://www.arduino.cc/en/Tutorial/LCDLibrary

Once I got it working the LCD library I decided to try this tutorial out which does not use the library:
http://www.arduino.cc/en/Tutorial/LCD8Bits

which also worked.

Here are my questions:

  1. My display is 2 x 16 characters (like the one in the first tutorial). How do I get text to display on the second row?

  2. Where is the doc for “LcdCommandWrite()”? I see in the second tutorial it is used to position the cursor among other things. Is there a list of ?byte? codes which tell me what each one does?