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+=pod
+
+=head1 NAME
+
+
+
+B<XPATemplate: Access Point Names and Templates>
+
+
+=head1 SYNOPSIS
+
+
+
+
+
+XPA access points are composed of two parts: a general class and a
+specific name.  Both parts accept template characters so that you
+can send/retrieve data to/from multiple servers at one time.
+
+
+
+=head1 DESCRIPTION
+
+
+
+
+
+When XPA servers call
+XPANew(),
+or
+XPACmdNew()
+to define XPA access points, they specify a string identifier composed of a
+class and a name. When clients communicate with XPA access points,
+they specify which access points to communicate with using
+an identifier of the form:
+
+  class:name
+
+All registered XPA access points that match the specified identifier
+will be available for communication (subject to access control rules,
+etc.)
+
+
+As of XPA 2.1.5, the length of both the class and name designations are
+limited to 1024 characters.
+
+
+The XPA class:name identifier actually is a template: it accepts wild
+cards in its syntax, so a single specifier can match more than one XPA
+access point.  (Note that the class is optional and defaults to "*".)
+The allowed syntax for clients to specify the class:name template is
+of the form shown below. (Note that "*" is used to denote a generic
+wild card, but other wild cards characters are supported, as described
+below).
+
+  template   	explanation
+  --------	-----------
+  class:name	exact match of class and name
+  name		match any class with this name
+  *:name	match any class with this name
+  class:*	match any name of this class
+  *:*		match any access point
+
+
+In general, the following wild-cards can be applied to class and name:
+
+  wildcard	explanation
+  --------	-----------
+  ?		match any character, but there must be one
+  *		match anything, or nothing
+  [...]		match an inclusive set
+
+
+Although the class:name template normally is used to refer to XPA
+access points, these also can be specified using their individual
+socket identifiers.  For inet sockets, the socket identifier is
+B<ip:port>, where ip can be the DNS-registered name,
+the ASCII IP number (e.g. 123.45.67.890) or the hex IP number
+(e.g. 838f3a60). For unix sockets, the identifier is the socket file
+name.  These socket identifiers are displayed as the fourth argument
+in the xpans display of registered access points.  For example,
+consider the ds9 program started using inet sockets. The xpans name
+server will register something like this:
+
+  csh> xpaget xpans
+  DS9 ds9 gs saord.harvard.edu:3236 eric
+
+You can access ds9 using ip:3236 in any of the three forms:
+
+  csh> xpaget saord:3236 file
+  /home/eric/data/snr.ev
+
+  csh> xpaget 123.45.67.890:3236 file
+  /home/eric/data/snr.ev
+
+  csh> xpaget 838f3a60:3236 file
+  /home/eric/data/snr.ev
+
+In the case of unix  sockets, the socket identifier is a file:
+
+  csh> xpaget xpans
+  DS9 ds9 gs /tmp/.xpa/DS9_ds9.2631 eric
+
+  csh> xpaget /tmp/.xpa/DS9_ds9.2631 file
+  /home/eric/data/snr.ev 
+
+This feature can be useful in distinguishing between multiple
+instances of a program that all have the same class:name designation.
+
+
+
+=head1 SEE ALSO
+
+
+
+See xpa(n) for a list of XPA help pages
+
+
+
+=cut