Macbook user accounts set up on my mac

Hi I'm using the latest rekordbox and my macbook has OSX Version 10.9.4.

What I would like to do is have 2 Macbook user accounts set up on my mac. 1 for general use including rekordbox and the 2nd user account for when I'm playing out, which will only use rekordbox (no internet, no mail etc) this way all my private files are protected from other dj's using my macbook.

The problem is the Library how do i only have 1 library for 2 macbook user accounts?