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Is there a call similar to describeTabs() but for all users?

I implemented a VF page using describeTabs() but I underestand this is only for the logged-in user:
<apex:page >
<apex:includeScript value="/soap/ajax/17.0/connection.js"/>
<script type="text/javascript">
function displayTabs(tabs) {
for( var i=0; i<tabs.length; i++) {
var tab = tabs[i];document.write(
" " + tab.label + " " + tab.sobjectName );
document.write("<br />");
document.write("<br />");
 sforce.connection.sessionId = '{!$Api.Session_ID}';
try {var
result = sforce.connection.describeTabs();
} catch(error) {
(var i=0; i < result.length; i++) {var tabSet = result[i];
document.write (tabSet.label);
document.write("<br />");
var tabs = tabSet.get("tabs");
<body >

And I am able to get the result like this in the screenshot.
User-added image

But, here's what I want to do: A custom VF page for admin to pull the same result but for *all* users, not just logged in user. Is there a call similar  to describeTabs() but for all users? thanks.