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Originally Posted by ddhoward Does clientprefs keep track of which plugin assigned which cookie?

Not really.

Originally Posted by ddhoward Or should plugin authors be careful to ensure that the cookie name is unique?

This. For example, in some of my plugins I retrieve quake sounds client preferences this way.

new bool:QPreferences[MAXPLAYERS + 1];
public OnClientCookiesCached(client)
{
    if (AreClientCookiesCached(client))
    {
        decl String:value[5], Handle:preferences;
        preferences = FindClientCookie("Quake Sound Pref");
        GetClientCookie(client, preferences, value, sizeof(value));
        CloseHandle(preferences);

        QPreferences[client] = bool:!StringToInt(value);
    }
}