1. An internally illuminated keyboard comprising: a plurality of keys including a first key operable in at least two different modes, the different modes being marked by spaced symbols distinguished from one another by different colors, a first one of the symbols being in a first area comprising a first material with a first one of the colors, and a second one of the symbols being in a second area comprising a second material with a second one of the colors; and a light source located below the first key, the light source being adapted to emit light of a third color and light of a fourth color; wherein the first and second areas are located side-by-side and the light source emits light at the spaced symbols simultaneously and, the first material transmits light of the third color therethrough but substantially blocks transmission of light of the fourth colour therethrough, and the second material transmits light of the fourth color therethrough but substantially blocks transmission of light of the third colour therethrough.