The DEFINE/ADDRESS command assigns a symbolic name to an
    address expression in a program. You can define a symbol for a
    nonsymbolic program location or for a symbolic program location
    having a long path-name prefix. You can then refer to that
    program location with the symbolic name. The /ADDRESS qualifier
    is the default.

    The DEFINE/COMMAND command enables you to define abbreviations
    for debugger commands or even define new commands, either from
    the debugger command level or from command procedures.

    The DEFINE/VALUE command enables you to assign a symbolic name to
    a value (or the result of evaluating a language expression).

    The DEFINE/LOCAL command confines symbol definitions to command
    procedures. By default, defined symbols are global (visible
    outside the command procedure).

    To enter several DEFINE commands with the same qualifier, first
    use the SET DEFINE command to establish a new default qualifier
    (for example, SET DEFINE COMMAND makes subsequent DEFINE commands
    behave like DEFINE/COMMAND). You can override the current default
    qualifier for a single DEFINE command by specifying another
    qualifier.

    In symbol translation, the debugger searches symbols you define
    during the debugging session first. So if you define a symbol
    that already exists in your program, the debugger translates the
    symbol according to its defined definition, unless you specify a
    path-name prefix.

    If a symbol is redefined, the previous definition is canceled,
    even if you used different qualifiers with the DEFINE command.

    Definitions created with the DEFINE/ADDRESS and DEFINE/VALUE
    commands are available only when the image in whose context
    they were created is the current image. If you use the SET IMAGE
    command to establish a new current image, these definitions are
    temporarily unavailable. However, definitions created with the
    DEFINE/COMMAND and DEFINE/KEY commands are always available for
    all images.

    Use the SHOW SYMBOL/DEFINED command to determine the equivalence
    value of a symbol.

    Use the DELETE command to cancel a symbol definition.

    Related commands:

       DECLARE
       DELETE
       SET IMAGE
       SHOW DEFINE
       SHOW SYMBOL/DEFINED