The bellboy directs the guest check in at the front desk.

行李员指引客人到前台办理入住手续。

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When the guest check in, please show this confirmation to the hotel reception.

客人入住时，请将此确认书交由酒店前台。

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Employees also scour the Internet for clues and check in with other Four Seasons properties where the guest has stayed.

员工们会在网上搜寻相关线索，并向客人住过的其他四季酒店核实。

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The Palms in Las Vegas is matching hotel guest check-ins with Klout scores.

FORBES: Klout: The Biggest Popularity Contest Of All

Occasionally, she'll check in as the most obnoxious breed of hotel guest: the road-weary whiner.

CNN: Confessions of a hotel mystery shopper

Instead of screen scraping the hotel reservation system and calling it a mobile app, a system of engagement presented on a smartphone will know that a guest has entered the lobby for the first time and probably wants to check in.

FORBES: A Billion Smartphones Require New Systems Of Engagement