Cookies

Yes. Whether you use Internet Explorer or Netscape, your cookies are saved to a simple text file that you can delete as you please.
In order to do this properly, remember to close your browser first. This is because all your cookies are held in memory until you close your browser. So, if you delete the file with your browser open, it will make a new file when you close it, and your cookies will be back.
Remember that deleting your cookie file entirely will cause you to "start from scratch" with every web site you usually visit. So, it may be preferable to open the cookies.txt file (in the case of Netscape) and remove only the entries you don't like, or go to the cookies folder (in the case of IE) and delete the files matching servers youdon't want.

The only cookies that you may want / need to keep are those for web-sites that require you to log-in. If you delete those cookies, the worst case is, that you will need to log-in the next time you go to the site.

Cookies are stored in 2 places for IE:
C:\Windows\Cookies
C:\Windows\Temporary Internet Files
(The above folder location varies for some versions of Windows.)

You can download various 'cookie' managers and cleaners. Just check your favorite download site.
I use www.nonags.com

If you have IE 5.5 or later, you can set limits on the cookies you receive.
In Internet Options, click on the 'Privacy' tab.
Adjust the privacy higher to restrict cookies.
Click the edit button, and remove any site that is either blocked or allowed that you wish to change the cookie policy for.
The next time you visit the site, a dialog box should pop up asking if you wish to accept cookies from this site.

Chas