- adjective referring to a program which does not make any non-standard system calls, using only the standard BIOS input/output calls rather than directly addressing peripherals or memory
- Said of a program which functions as expected within a given setting, or of that which adheres closely to a given standard. For example, an application that interacts as it should with given operating system, as opposed to bypassing it for certain operations. This contrasts with ill-behaved, in which the converse is true.
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