its basically variable valve timing. when you reach a certain RPM (imports will rev to the moon and back) then the compter tells the cams to shift- the cams on vtec engine have double the lobes, the double set is higher- so the shift moves the higher lobes into place, rasing the valves a little higher, therefore rasing perfomance at higher rpms.
my explanation.
later
edit: oops, a little late
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