Accounts

In this part of system preferences you can manage accounts that have access to the computer, change administrator options and add login items to you start up.
Here is what the account window looks like: So the bar on the left shows all the accounts that are present on the computer, on my computer there are 3 accounts. Under the account bar you can see an "Login Options" button. It allows you to set which apps you want you computer to open when your computer turns on.