PROTECTION CODES

	All files are assigned protection codes to prevent inadvertant
changes to files or possible destruction by an unsophisticated user.
	
If the code is:			Then the file is:

	1			read protected against owner

	2			write protected against owner

	4			read protected against all others
				in owner's project group
	
	8			write protected against all others in
				owner's project group

	16			read protected against all others who
				do not have owner's project number

	32			write protected against all others who 
				do not have owner's project number

	64			an executable program; can be run only

		Individual codes added to the compiled protection <64>
	have meanings different from those of the data file protection
	codes above.  These compiled codes follow:

	1			execute protection against owner
	
	2 			read and write protection against owner
	
	4 			execute protection against owner's 
				project group

	8			read and write protection against 
				owner's project group

	16			execute protection against all others
				who do not have owner's project number

	32			read and write protection against all
				others who do not have owner's project
				number

	128			program with temporary privileges
				(normally only when file's protection
				includes <64>).


	Commonly used protection codes:

	<60>	32+16+8+4	read and write protection against everyone
				except the owner (the system default)

	<40>	32+8		write protection against all but owner

	<0>			No protection at all

	<232>	64+128+40	An executable program with temporary privi-
				leges that is write protected against all
				but the owner