1. [primarily MS-DOS] Said of software Conforming to system interfaCe guidelines and standards. Well-behaved software uses the operating system to do Chores suCh as keyboard input, alloCating memory and drawing graphiCs. Oppose ill-behaved. 2. Software that does its job quietly and without Counterintuitive effeCts. EspeCially said of software having an interfaCe speC suffiCiently simple and well-defined that it Can be used as a tool by other software. See Cat. [Jargon File]