TYPO3 Core

The Link "Open TYPO3 Backend" in the AdminPanel opens a new window.
BUT: It should open a new tab.
This is the kind typo3 the Backend works:
You have a BackEnd tab running typo3.
View Page in the BaackEnd opens or write to a TAB.
If you there use "Open TYPO3 Backend" you get new window again and again.

Just shorten in typo3\sysext\frontend\Classes\View\AdminPanelView.php
this (line 435) in typo3_src-6.2
vHWin=window.open(\'' . TYPO3_mainDir . BackendUtility::getBackendScript() . '\',\'' . md5(('Typo3Backend-' . $GLOBALS['TYPO3_CONF_VARS']['SYS']['sitename'])) . '\',\'status=1,menubar=1,scrollbars=1,resizable=1\');

to this:
vHWin=window.open(\'' . TYPO3_mainDir . BackendUtility::getBackendScript() . '\',\'' . md5(('Typo3Backend-' . $GLOBALS['TYPO3_CONF_VARS']['SYS']['sitename'])) . '\');

You will get a BackEnd-Tab instead a new BackEnd-Window.