The *, #, A, B, C and D keys are still widely used worldwide by amateur radio operators and commercial two-way radio systems for equipment control, repeater control, remote-base operations and some telephone communications systems.
Kunci *, #, A, B, C, dan D masih banyak digunakan di seluruh dunia oleh operator radio amatir dan sistem radio dua arah komersial untuk peralatan kontrol, kontrol repeater, operasi berbasis remote dan beberapa sistem komunikasi telepon.