Tools - DOS box... |
The menu item "Tools → DOS box..." or the shortcut "Ctrl+D" open a DOS window.
Fur that purpose FreeCommander opens the Windows standard dialog "DOS prompt".
If the menu item is activated while the "Shift" key is pressed, the DOS window is opened with administrator rights.
In Windows 7 this dialog can be opened with "Start → All programs → Accessories → DOS prompt".