Parameters

logical-name

   Specifies the logical name string, which is a character string
   containing from 1 to 255 characters. The following rules apply:

   o  If the logical name is to be entered into the process or
      system directory logical name tables (LNM$PROCESS_DIRECTORY,
      LNM$SYSTEM_DIRECTORY), then the name can only have from 1 to
      31 alphanumeric characters, including the dollar sign ($)  and
      underscore (_).  If the logical name translates to a logical
      name table name, any alphabetic characters in the name should
      all be uppercase.

   o  If you specify a colon (:)  at the end of a logical name, the
      DEFINE command saves the colon as part of the logical name.
      (This is in contrast to the ASSIGN command, which removes the
      colon before placing the name in a logical name table.) By
      default, the logical name is placed in the process logical
      name table.

   o  If the string contains any characters other than uppercase
      alphanumerics, the dollar sign, or the underscore character,
      enclose the string in quotation marks (" ").  Use two sets of
      quotation marks ("" "")  to denote actual quotation marks.
      When you enclose a name in quotation marks, the case of
      alphabetic characters is preserved.


equivalence-name[,...]

   Specifies a character string containing from 1 to 255 characters.
   The following rules apply:

   o  If the string contains any characters other than uppercase
      alphanumerics, the dollar sign, or the underscore character,
      enclose the string in quotation marks. Use two sets of
      quotation marks to denote an actual quotation mark. Specifying
      more than one equivalence name for a logical name creates
      a search list. A logical name can have a maximum of 128
      equivalence names.

   o  When you specify an equivalence name that will be used as a
      file specification, you must include the punctuation marks
      (colons, brackets, periods) that would be required if the
      equivalence name were used directly as a file specification.
      Therefore, if you specify a device name as an equivalence
      name, you must terminate the equivalence name with a colon.

   The DEFINE command allows you to assign multiple equivalence
   names to a single logical name. For example, you can use the same
   logical name to access different directories on different disks
   or to access different files in different directories.