well, I was suggested to remove the contents of the cache as i get out of the browser netscape from the .netscape folder. is that really necessary? if so what are the rest to be done?
can anybody please tell me?

You really don't have to remove those files. I was under the understanding that netscape did that automatically. All you would have to to to view these contents is type cd ~/.netscape/ and the files would be there, though.

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ALL YOUR BASE BELONG TO CHEESEPUFFS.

but what my friend told was to delete them since they let others know what sites we browse! sometimes it need to have privacy about these things. is there any remedy for that?

Yes... your friend is right. It will cover "some" of your tracks.
You will also need to delete your history and clean out cookies
as well if you really don't want anyone to know where
you've been.

can i know what exactly i have to remove?
because some sites do not give me access if i remove the cookies!

The only way you could know which cookies to keep and which to delete would be to figure out which ones you need to access your sites. Then, you could just delete all the cookies except for those. That's the only way I could think of.

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Yeah... that can be a pain though.

You might be able to find
some utility program (ala Norton Clean Sweep or something)
that will be able to "filter" what cookies are deleted but I
personally don't know of one for UNIX.

You could always NOT browse sites that you don't want
anyone to know about (I'm sure your employer would prefer
this) or you could create a separate user account for
"dubious" browsing and set the browser not to accept cookies
then clean out cache and history before you log out.

Remember one thing, if you're going through your company's
network, your activity CAN BE MONITORED. So....
"let's be careful out there"