[phplib] how to prevent someone from registering for temporary accounts once more? From: ÖÜÁ (zl8888 <email protected>)
Date: 09/05/00

  Our website betimes issues chemfibre product infomation for our customers.
Anyone can apply for a temporary account through a free-registering program,and he can login into our website to browse chemfibre product information for a week.
  The free-registering program firstly reads the cookie for temporary account.If the cookie can be read from customer browser,tell him that he had once applied and not more.Then inspects the email of the applicant from our customer table,if the email has existed in the table,then tell him that he had once applied and not more. If nothing above,we will post him a temporary account and password,and set a cookie residented his computer.
  But someone may know what we can do,they delete the cookie or forbidden to use cookie,and apply for another account with different email.Then they can browse infomation for ever without fee.

  By now, I can do nothing to solve this question.

  Can you tell me some idea?

Best regards.