.pg
.x flag
.lt
------------------------------------------------------------------------
FLAG	name <bit8,bit7,...bit1>   [INIT=initial]
------------------------------------------------------------------------
.el
.b 3
The FLAG macro will geneate a variable and define bit offsets into this
variable to specify boolean flags.
.b
If ^&initial\& is not specified, 0 is assumed.
.b
.tp 5
For example:
.b
.lt
	flag	example <present,,,,value,,,>
.el
.b
will generate the following code:
.b
.lt
	example:
		.byte	0
	present = 128			; bit 8
	value   = 8			; bit 4
.el
.b
.tp 5
In addition, these boolean flags can be set or cleared by the SET and CLEAR
macros. 
Plus, each flag bit can be tested by specifing the name of the flag appended to
the bit name in an IF statement.
.b
For example, using the FLAG example above: 
.b
.lt
	if	<example.present> then
		statements-1
	end
.el
.b
.tp 5
is equivalent to:
.b
.lt
	if	<bitb #present,example> then
		statements-1
	end
.el
.b
See also SET and CLEAR.