Most of the free sites or programs are going to have a 20 minute delay on the stock prices.
Does he have an online stock broker? Usually they have a real-time java applet to display selected stocks and their prices.
One site I have used is:
http://www.thomsonfn.com/
Go to "Portfolio" at the top and sign up for "WealthTracker". It's not a ticker tape display but most people prefer this type of java display for watching stock prices. But real-time quotes aren't free, at this site they're $9.95/month. There may also be an additional $3-$4/month exchange fee.
Another site for real-time quotes is
http://www.money.net/ which gives you more for a little more money.