AMIGA AREXX PDF

All ARexx programs are started by the resident process. The resident process creates a new process, loads the ARexx program into the new process, and invokes the ARexx interpreter. Besides keeping track of all currently-executing programs, the resident process also manages ARexx resources, including the Clip List and the Library List, both described in a later section. Note that the resident process is also an ARexx host application, a program that can send and receive ARexx messages.

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All ARexx programs are started by the resident process. The resident process creates a new process, loads the ARexx program into the new process, and invokes the ARexx interpreter. Besides keeping track of all currently-executing programs, the resident process also manages ARexx resources, including the Clip List and the Library List, both described in a later section. Note that the resident process is also an ARexx host application, a program that can send and receive ARexx messages.

Finding the Resident Process On the typical Amiga system the ARexx resident process is always active, launched from within the system startup file using the rexxmast command. Your application programs should always ensure that the resident process is active before using or accessing the ARexx environment. If the resident process cannot be found, your application should disable its ARexx features. You may also wish to inform the user that ARexx is not available. An ARexx message is a message protocol described later in the book used by programs in the ARexx environment.

ARexx ports are defined using the Exec function CreatePort. Note that a port name must be supplied. More details on ARexx port creation and naming can be found in Chapter 7.

An ARexx port is typically used by a host application to send a command to the resident process. An ARexx macro program may be started in this fashion, and the results of the macro will be returned to the application via a reply message to its ARexx port. Details can be found in Chapter 4. These are mostly used from within an ARexx program, but are also available to any application with an ARexx port.

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AmigaOS Manual: ARexx

William Hawes is no longer involved in development of Amiga programs and no other Amiga-related firm is financing new versions of ARexx. Notwithstanding this fact, the existing version of ARexx continues to be used, although it is not distributed with MorphOS. From the ARexx manual: ARexx was developed on an Amiga computer with k bytes of memory and two floppy disk drives. The language prototype was developed in C using Lattice C , and the production version was written in assembly-language using the Metacomco assembler. Using ARexx, for example, one could request data from a database application and send it to a spreadsheet application. To support this facility, an application must be "ARexx compatible" by being able to receive commands from ARexx and execute them.

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All rights reserved. It is especially useful as a scripting language which allows you to control and modify applications and to direct how they interact with each other. This manual introduces you to ARexx, tells you how to create ARexx programs and provides a reference section of ARexx commands. Chapter 1. Introducing ARexx This chapter gives an overview of ARexx, how it works on the Amiga, and the basic features of the programming language.

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