PHP page access from a particular site only

Hi,
  I have a php page (aaa.php) that would like to show to my client.  However, I hope the client must link from a particular site say, http://www.abc.com/  otherwises they cannot be accessed (aaa.php)

is it possible?
gorexyAsked:
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TeRReFCommented:
You can use $_SERVER['HTTP_REFERER'];
to check if the user came from that particular link and show the page if so..
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