High Quality Content by WIKIPEDIA articles! In computer programming, apel (the initialism represents "A Portable Emacs Library") provides support for writing portable code in Emacs Lisp. XEmacs features a version of apel called apel-xemacs. Computer programming (often shortened to programming or coding) is the process of designing, writing, testing, debugging / troubleshooting, and maintaining the source code of computer programs. This source code is written in a programming language. The code may be a modification of an existing source or something completely new. The purpose of programming is to create a program that exhibits a certain desired behaviour (customization). The process of writing source code often requires expertise in many different subjects, including knowledge of the application domain, specialized algorithms and formal logic.

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