I created the intraday price alert app to automatically monitor the prices of the companies in which I have taken an interest. During the day, if any of these companies surpasses the specified price a red siren on my desk goes off (it literally does, see the post for a video). Or when I'm away from my desk it sends me an email alert. This means I can happily work on something else or go out and do other things. If I get an alert I come back to my desk to place my orders.
Read more on The Data Wrangler: http://www.the-data-wrangler.com/intraday-price-alert/