How to make arduino(ethernet shield) always listen to HTTP request from PHP

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hi all..

i'm on way developing simple full-duplex communication between arduino , php(server side scripting). here objectives :

1) open/closed arduino's pin controlled server side(simple php page). - stucked
2) received post/get request arduino insert temperature values database. simple detected temperature value sensor , @ end making http request server side - done

what mean full-duplex is, arduino can receive/send request from/to web server running on top of php language, , @ same time, server side can receive/send request from/to arudino well.

what cant figure out is, how arduino keep listening http request made server side??

the web server , arduino in same network , web server hosted inside local pc running on lampp(linux mint). ethernet shield connected via cat5 cable through router directly.

what core concept make both of communicated?



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