The program will show you a green bar on your cell (or cool BacMeter on the Palm/PocketPC) together with the BAC if you result is below 0.04.
If is bigger, but less than 0.08, you will see a yellow bar together with a message "Caution!"
If you approach 0.08, you will see a red bar, warning message and your alert will be activated (the phone may vibrate or play a sound).
In the same time you will see the phone number of your friend and your cab, so you call them if you want to.

Any time during the program work you can :
 1) add more drinks
 2) check the drink stat for the last month
 3) check your current BAC
 4) clear the history
    (this will erase all past data except your profile)
 5) setup your profile.
 6) exit mobileBAC