file-spec

    Specifies the command procedure to be executed. For any part
    of the full file specification not provided, the debugger uses
    the file specification established with the last SET ATSIGN
    command, if any. If the missing part of the file specification
    was not established by a SET ATSIGN command, the debugger assumes
    SYS$DISK:[]DEBUG.COM as the default file specification. You can
    specify a logical name.

 parameter

    Specifies a parameter that is passed to the command procedure.
    The parameter can be an address expression, a value expression
    in the current language, or a debugger command; the command must
    be enclosed within quotation marks (").  Unlike with DCL, you
    must separate parameters by commas. Also, you can pass as many
    parameters as there are formal parameter declarations within the
    command procedure. For more information about passing parameters
    to command procedures, see the DECLARE command.