2 IN
The IN command sets the default directory.  The desired default directory
is specified by the parameter, p1. 

Command Format:

	      $ IN p1

                where
                       p1 = {node::}{device:}{directory}
                or
                       p1 = logical_name_for_a_directory{:subdirectory}
                or
                       p1 = .subdirectory
                or 
                       p1 = \
                or 
                       p1 = PRE

If the specified directory does not exist, an error message is
generated and the default directory is not changed. 
!---------------------------------------------------------------------
03 {node::}{device:}{directory}                                       

Specifies the node, and/or device, and/or directory for the default
directory. 

The curly brackets indicate optional items in the parameter (p1).
   If node:: is not specified, it defaults to the current node::
   If device: is not specified, it defaults to the current device:
   If directory is not specifed, it defaults to the current directory.
   The directory does not have to be enclosed in [ ] brackets.  

EXAMPLES:
 $ IN VAXLA:: ! Sets default directory equal to 
              ! VAXLA::current_default_device:current_default_directory

 $ IN DUA0:   ! Sets default directory equal to
              ! current_default_node::DUA0:current_default_directory

 $ IN DOT     ! Sets default directory equal to
              ! current_default_node::current_default_device:[DOT]

 $ IN VAXLB::DRA1:DIR     ! Sets default directory equal to
                          ! VAXLB::DRA1:[DIR]

 $ IN DIR.CAT ! Sets default directory equal to 
              ! current_default_node::current_default_device:[DIR.CAT]
!---------------------------------------------------------------------
3 .subdirectory                                                       
Specifies that the default directory is to be set to

             [current_default_directory.subdirectory]

The current_default_node and current_default_device are not changed.

EXAMPLE:
  $ IN .NEXTDIR               ! Sets the default directory to
                              ! [current_default_directory.NEXTDIR]
!---------------------------------------------------------------------
3 \                                                                   
\ specifies that the default directory is to be the parent directory
of the current default directory. 

 EXAMPLES:

   $ IN \.ADIR         ! Sets the default directory to the daughter
                       ! directory ADIR of the current directory's
                       ! parent directory.
                                
   $ IN \\.SOMEDIR     ! Sets the default directory to the daughter
                       ! directory SOMEDIR of the current directory's
                       ! grandparent directory.
!---------------------------------------------------------------------
3 Logical_name_of_a_directory{:subdirectory}                          

Specifies the desired default directory by logical name.  

  EXAMPLE:  $ IN SYS$LOGIN     ! Sets the default directory equal to 
                               ! the default login directory.

If the logical name is not defined, then the input is treated as a
{node::}{device:}{directory} entry. 

If the optional item indicated in { } brackets is given, the default
is set to the specified subdirectory of the directory specified by the
logical name. 

  EXAMPLE:  $ IN GR$PROG:SOURCE   ! SOURCE is a subdirectory of the 
                                  ! directory whose logical name is 
                                  ! GR$PROG
!---------------------------------------------------------------------
3 PRE                                                                 
PRE resets the default directory to the default directory that was
defined before the last previous use of IN. 

  $ IN PRE is useful for 'toggling' between  two default directories. 
!---------------------------------------------------------------------
