How to know login ID

I used dtpasswd for user check like it does login here.
How can I know userid and password in CGI program after login?

and Is there a way to popup a dialog in Java Script like password check ?
 
kiyojieAsked:
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icdCommented:
(1)
Look for an environment variable REMOTE_USER which should be set once the user has logged in.
(2)
Depends. (Well what you you expect for ten point! :-) )
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kiyojieAuthor Commented:
What does words "should be set once the user has logged in."  mean ?
REMOTE_USER value always has null in cgi program.
(ie : getenv("REMOTE_USER")   )
Please give me more detailed answer.
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icdCommented:
I suggest if you want a very detailed answer you ask the question again and offer more points ;-)
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