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		GENERAL  INFORMATION

	Meanings of various extensions.

	bak:	back up of source
	ctl:
	def:	file of declarations to be used with the
		use of corresponding files
	info:	informational -- for detailed info about a
                particular class of files, see corresponding
		*.info file.
	rel:
	sai:	sail  source  text
	sav:


		CONTENTS OF VARIOUS FILES


apar
	data structure and procedures operating on anti-
	parallel pairs of straight line segments in a picture.

cdisp
	subset of ps.* for displaying corner data(only).

c2
	subset of ps.* for making corners.

define
	various standard, constant definitions.

direct
	data structure containing (data+procedures) for
        manipulating on 1..8 directional information.

ldisp
	subset of ps just for displaying linked data

ps
	makes *.p and *.s files as well as operates on them.
        this is just a data structure (procedures included).
        (see psdisp)

psdisp
	makes use of ps.* to derive meaningful work.

seg
	data structure -- (data + procedures) on *.seg and
	*.sseg files.

segmak
	uses ps.*, seg.*, with user interfacing,  for 
	processing .seg and .sseg files.

segmaker
        executable version of segmak.sai

thrmaker
	Makes *.thr files.