Guide Mode is a tutorial aid available to the beginning DEC
       DATATRIEVE user. It is completely self-explanatory. However,
       Guide Mode is available only from VT52, VT100, VT125, VT220,
       VT240, and compatible terminals. To enter Guide Mode, type the
       command:

       SET GUIDE

       If you are using an unsupported terminal, DEC DATATRIEVE will
       display the error "Invalid terminal type for Guide Mode" and
       return you to the DTR> prompt.

       An advanced form of Guide Mode is also available. It covers
       significantly more of the DEC DATATRIEVE language. To enter
       Advanced Guide Mode, type the command:

       SET GUIDE ADVANCED