This article is from the Apple II Csa2 FAQ, by Jeff Hurlburt with numerous contributions by others.
One of the best features of DOS 3.3 is that any bootable DOS diskette can create other bootable diskettes. INIT HELLO - formats one side of the diskette in the currently active drive, adds DOS, and saves the current program as HELLO. The program that's automatically placed on the new diskette is the one in memory when INIT is executed. It is called the "greeting program" or "hello program" because it is the program which will be run when the diskette is booted. Usually, the program is named HELLO; but, you can INIT HOWDY, or any name you like. The hello program can be very simple, such as ... 100 PRINT CHR$(4) "CATALOG" 110 END You are free to load in and change the hello program or even delete it, just like any other. The one restriction is that once a diskette is INITed, the name of the hello program is fixed for that diskette unless you use a utility (like Copy II+) to make a change. This is why it's a good idea to stick with the name HELLO. You will always know what the hello program's name is. Once a diskette is INITed it can be used to store your programs and data files. -----------------------
 
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