
 The ASN command defines, deletes or displays logical-device assignments.
 Logical-device assignments associate logical names with physical devices,
 pseudo devices or other logical devices.  When a user assigns a logical
 name to a pseudo or logical device, the system immediately resolves the
 assignment to the associated physical device.

 Logical-device names have the same syntax as physical device names
 (i.e. DDnn:).  The 2-character name can either be equivalent to a standard
 physical device name, or can be any two letters.

 When a task is installed, or the system processes an Assign LUN directive,
 the system scans the logical device table before the physical device table
 so the user may define logical names that are identical to physical names
 but which reference another device.  The logical name will take preference.

 The general format of the ASN command is:

	ASN [PPnn:] [=] [LLnn:] [/Keyword][/Keyword]
 
 Where:	PPnn is the physical device name
		LLnn is the logical device name
		keyword is one of /GBL, /LOGIN, /TERM=TTnn:
 Further information is given in the sub-categories TYPES and EXAMPLES.
2 TYPES

 There are three types of logical-device assignments, Global, Local and Login:-

	Global assignments apply to all tasks running in the system.  They are
	defined/listed/deleted if the /GBL keyword is specified.

	Local assignments apply only to tasks initiated from the terminal used
	to make the assignments.  They are defined/listed/deleted if no keyword
	is specified.

	Login asignments apply only to tasks initiated from the terminal used
	to make the assignments while the current user is logged in.  They are
	defined/listed/deleted if the /LOGIN keyword is specified.

	Local assignments take precedence over both login and global
	assignments.  Login assignments take precedence over global
	assignments.
2 EXAMPLES

  Local Assign operations:		ASN ppn:=llnn:
					ASN ppn:=llnn:/TERM=TTn:
  Login Assign operations:		ASN ppn:=llnn:/LOGIN
					ASN ppn:=llnn:/LOGIN/TERM=TTnn:
  Global Assign operation:		ASN ppn:=llnn:/GBL
  Local & Login Display operations:	ASN
					ASN /TERM=TTn:
  Global Display operations:		ASN /GBL
  Local Delete operations:		ASN =
					ASN =llnn:
					ASN =/TERM=TTn:
					ASN =llnn:/TERM=TTn:
  Login Delete operations:		ASN =/LOGIN
					ASN =/LOGIN/TERM=TTnn:
					ASN =/LOGIN/TERM=TTn:
					ASN =llnn:/LOGIN/TERM=TTn:
  Global Delete operations:		ASN =/GBL
					ASN =llnn:/GBL
