1  Editor
      By default, DEC DATATRIEVE uses EDT when you issue the EDIT
      command. You can specify DEC TPU, LSE, or EDT by assigning the
      logical name DTR$EDIT. There are two ways to assign DTR$EDIT
      to the acronym TPU, LSE, or EDT. Note that you must specify the
      three-character acronym, such as TPU, not DEC TPU.
   
      o  Use the DCL DEFINE command. For example:
   
         $ DEFINE DTR$EDIT TPU
   
      o  Use the DEC DATATRIEVE function FN$CREATE_LOG from within DEC
         DATATRIEVE. For example:
   
         DTR> FN$CREATE_LOG ("DTR$EDIT", "LSE")
   
      The assignment from within DEC DATATRIEVE lasts for that DEC
      DATATRIEVE session. To make the assignment permanent, use the
      DEFINE command in your login file.
   
      To use LSE with callable DEC DATATRIEVE, add the module
      name LSE to your DEC DATATRIEVE options file. For example:
      SYS$SHARE:DTRSHRxx/SHARE, - DTR$LIBRARY:TERMSERVE/LIBRARY
      /INCLUDE=(ADT,EDT,GUI,HLP,LSE,TPU)
   
      This options file enables calling programs to use ADT, the EDT
      editor, Guide Mode, DEC DATATRIEVE online help, LSE, and DEC TPU.
   
      See the documentation for LSE for more information about that
      product. See the help topic DEC TPU for more information about
      using DEC TPU with DEC DATATRIEVE.
    
   
2  LSE
      DEC DATATRIEVE supports editing with LSE from within DEC
      DATATRIEVE. This support includes LSE templates for DEC
      DATATRIEVE that allow users to edit DEC DATATRIEVE definitions,
      commands, and statements in an environment that is sensitive to
      the DEC DATATRIEVE syntax.
    
   
2  Templates_for_LSE
      The LSE templates for DEC DATATRIEVE offer command completion
      and syntax recall for the intermediate to advanced DEC DATATRIEVE
      user. Users of the templates should already know how to use LSE.
    
   
3  DCL_Level
      To use the templates from DCL level, invoke LSE at the DCL prompt
      and specify DEC DATATRIEVE as the editing environment. You can do
      this in one of two ways:
   
      o  Use the file type .DTR for the file you wish to edit with LSE.
         Specifying the .DTR file type causes LSE to use the editing
         environment file for DEC DATATRIEVE.
   
         For example, you want to use LSE to create a DEC DATATRIEVE
         procedure that will generate a payroll report:
   
         $ LSEDIT PAYROLL.DTR
   
         This command invokes LSE and sets the language-sensitive
         editing environment to DEC DATATRIEVE. The editing buffer
         on your screen already contains the placeholder {DATATRIEVE_
         session}. Expand {DATATRIEVE_session} by positioning the
         cursor on the placeholder and pressing <CTRL/E>. You can begin
         editing the procedure with LSE.
   
      o  Invoke LSE at the DCL prompt, set the language to DEC
         DATATRIEVE, and type in the placeholder that begins a DEC
         DATATRIEVE editing session.
   
         For example:
   
         $ LSEDIT
   
         At the LSE prompt, set the language to DEC DATATRIEVE:
   
         LSE> SET LANGUAGE DATATRIEVE
   
         In the editing buffer, type {DATATRIEVE_session} as it
         appears here, with the braces ({}). Expand that placeholder
         by positioning the cursor on the placeholder and pressing
         CTRL/E.
    
   
3  DTR_Level
      To use the templates from within DEC DATATRIEVE, assign DTR$EDIT
      to the acronym LSE, then use the EDIT command:
   
      DTR> FN$CREATE_LOG ("DTR$EDIT", "LSE")
      DTR> EDIT
   
      DEC DATATRIEVE opens a LSE editing buffer. In the editing buffer,
      type in the placeholder that starts a DEC DATATRIEVE session
      {DATATRIEVE_session}. Expand that placeholder by positioning the
      cursor on the placeholder and pressing CTRL/E.
    
   
3  Key_Definitions
      To save keystrokes, you can define a key to print the placeholder
      {DATATRIEVE_session}. For example, adding this line to your LSE
      initialization file enables the use of the key sequence GOLD/D
      for printing the placeholder when you are in LSE:
   
      define key/if_state=gold D "do ""enter text {DATATRIEVE_session}"" "
   
      LSE continues lines longer than 80 characters off the template
      screen. If you don't want to insert continuation characters
      to see the entire display of long lines, you can define keys
      for horizontal scrolling in your LSE initialization file.
      For example, you could add the following lines to your LSE
      initialization file to enable right and left scrolling with use
      of the GOLD (PF1) and angle bracket (<>) keys:
   
      ! Define horizontal scrolling keys
      define key/if_state=gold ">" "repeat 32 shift/forward"
      define key/if_state=gold "<" "repeat 32 shift/reverse"