.pg
.x external > module
.x module
.lt
------------------------------------------------------------------------
EXTERNAL MODULE	module-name <argument-list> [<default-list>]
------------------------------------------------------------------------
.el
.b 3
The EXTERNAL MODULE macro specifies that ^&module-name\& is an external module
and that _<^&argument-list\&_> are the required arguments for the external
module.
.b
If no arguements are specified in _<^&arguement-list\&_>, no arguments are
passed to the external module and _<_> must be specified as a place holder for
the _<^&argument-list\&_>.
.b
If _<^&default-list\&_> is specified, each element in the _<^&argument-list\&_>
must be present in the _<^&default-list\&_>; plus each element in the
_<^&default-list\&_> may be set to a default value. 
.b
For example:
.b
.lt
	external module LIB$DAY_OF_WEEK <day,num> <day,num=#0>

	lib$day_of_week	day=&day
.el
.b
will produce the following code:
.b
.lt
	pushl	#0
	pushal	day
	calls	#2,LIB$DAY_OF_WEEK
.el
.b
See also FORWARD MODULE, GLOBAL MODULE, and MODULE.