Well I will admit that I have not used Corel Linux, but a few things that you can try are looking for a launch menu, something like the start menu in windows, here you will want to look for something such as terminal, failing this look for an option for 'run application...' at the prompt try 'xterm'.
If neither of the the above work, try hitting <ctrl><alt><f3>, this should bring you to a text command mode, when you want to get back to the GUI hit <ctrl><alt><f7>.
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