"Keep my tab open." Music to a bartender's ears. More often than not, it means more sales - and bigger tips. But managing tabs can be a pain.

Sellers like Aeronaut Brewing Co. in Somerville, Massachusetts, relied on a manual paper system to keep track of open tabs. Each night they'd fill up an index card filing box with dividers to keep customers' cards organized. Every time a customer ordered a new drink, they'd pull out the box, find the card, write down the new drink, and put the card back. In owner Dan Rassi's words, "It sucked."

That's why we're adding an Open Tickets feature to Square's POS. It's an easy way for you to keep your customers' tabs open with just the tap of a button.