The cookie settings can be changed in the "Internet options", accessible by clicking on the gear icon in top right corner of the browser. Doing so pops up this window:
The cookie settings are under the "Privacy" tab, already selected in the above image. Within this tab, click on the "Advanced" bar that pops up a window such as this one:
The image above is the cookie settings my machine has and we've been discussing. Note that you'll need to place a checkmark to the "Override automatic cookie handling" checkbox.
The "host" file with no extension is in the "C:\Windows\System32\drivers\etc" folder. As an administrator you can edit this file with notepad and add the following entries;
The forum software removes the extra spaces between the last number and the first alfa character. You can just hit tab in notepad to restore the extra spaces, or just leave it as it is.
The host file is the first that Windows looks into to resolve the name to an IP address. Resolving all atdmt.com known hostnames to the loopback IP of your PC prevents your browser contacting these hosts on the Internet. If your browser cannot reach these hosts, then certainly the cookie won't come from these hosts either.
Let me know, if the info is helpful...