Q1010 Can I find out how large a users cache is?

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Only in Netscape Navigator 4+ and only after asking for extra privileges:

<SCRIPT LANGUAGE="JavaScript1.2"><!--
if (document.layers) {
    netscape.security.PrivilegeManager.enablePrivilege('UniversalPreferencesRead');
    alert('cache size = ' + navigator.preference('browser.cache.disk_cache_size'));
}
//--></SCRIPT>