Square Inc. and Lemon Inc., two companies that offer mobile wallets on Apple's iPhone handsets, have updated their apps to work with Apple's Passbook wallet. 

Passbook is a wallet app that stores cards and tickets from other apps. It can switch on certain cards based on a user's location or the time of day. For example, users of the Starbucks card app can link it to Passbook so their cards appear on the iPhone's screen when they visit Starbucks locations. 

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