Press the up or down arrow keys to traverse through previously executed commands. Else, try pressing Shift + Alt + C if none of the above worked. This page lists the codes which may be input into the Console Window, a special debugging window which may be accessed on non-ironman games by pressing Shift+2, ALT+2+1, Shift+3, §, ~, ^, °, ², or ` (key varies based on keyboard layout).