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Modifications have been made to the department's Volker Craig VC404 and VC4404 terminals 'to enable characters to be displayed in inverse video on an individual character by character basis. This feature has been put to good use in programs such as "Explain" and "Edit" where there is a need to highlight character strings. The two terminal models have different internal designs necessitating the use of different control sequences to enable and disable inverse video. The VC404 uses "control Q" to toggle between normal and inverse video while the VC4404 uses "control Q" to enable inverse video and "control O" to disable it.