2500 \- BVH2500 videotape recorder 2500(1) apsend \- send troff output to phototypesetter apsend(1) dd, dblbuf \- convert and copy a file dd(1) lp \- printer output lp(1) null \- data sink null(4) plot \(mi graphics filters plot(1) tape, mt \- identify and manipulate magnetic tape tape(1) tar \- tape archiver tar(1) thinkblt, think \- print on thinkjet thinkblt(9)