[cctalk] Re: Computer Museum uses GreaseWeazle to help exonerate Maryland Man

A somewhat similar but more primitive thing is found in the DEC VT71/t typesetting terminal, which has a row of 16 "User Defined Keys" at the top. These have double keycaps, an outer transparent plastic shell that snaps over a smaller ordinary keycap with no label. The idea is that you could make your own labels and insert them under the clear shell. Then again, a lot of users simply laid a cardboard strip with legends just above the top row: http://bitsavers.org/pdf/dec/terminal/vt71t/vt71t.jpg