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edit
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edit [filename]
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Edit the file of your choice from within YAN. The default editor
is Q.EXE, but if the environmental variable EDITOR is set, you
can use your favorite editor (provided it can run in the memory
available). You could, of course, rename another editor to Q.EXE.

This command uses the shell function and the returned error codes
are detailed. It is advisable to read the Shell text.

>> Example:  edit runme.scr
