Answers to Part 9 Exercises

	Answers to Part 9 Exercises

	Answer to :ab Overload Exercise

	In every case, the other meaning would prevail over the :ab
	meaning. Reason: all the other metacharacters and metastrings
	take effect as soon as the last character of the string is typed
	in. But an abbreviation doesn't take effect until you type the
	next following character in, proving that your string was a word
	by itself. So the other metavalue will always be triggered
	first.

	Answer to Multi-Line Problem

	There are various uses for making some source-file commands
	unexecutable from screen mode. Here are two examples.

	You have a source file that makes complex changes in a certain
	area of your file, then prints the modified lines so you can look
	over the changes. But when you are in screen mode, the changes
	are displayed anyway, so the line-mode print command only
	duplicates the display -- but it does require you to hit the
	return key and wait for a screen repaint before you can continue
	screen editing. Putting the command to print on a second line
	makes sure printing will only happen when you need it.

	Your source file automates a lot of detail when you are doing a
	routine cleanup of an imported file while in line mode. But when
	the file is too messed up for a blind cleanup from line mode, and
	you must work from screen mode, a few of the commands in your
	source file are likely to do more harm than good. When those few
	commands are on a second line in the file, they only run when you
	are doing routine work from line mode.

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