 The two systems share many escape codes with the ANSI system, with extensions that are not necessarily meaningful to computer terminals.Both systems quickly fell into disuse, but ECMA-48 does mark the extensions used in them as reserved.Although termcap/terminfo-style libraries were primarily developed on and for Unix, since about 1984 programs running on Unix-like operating systems could almost always assume they were using a terminal or emulator that supported ANSI sequences; this led to widespread use of ANSI by programs running on those platforms.