VMS Help SET, COMMAND, Qualifiers, /OBJECT  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /OBJECT[=filespec]

    Specifies /OBJECT mode to create an object module from a
    command definition file and optionally provides an object file
    specification. You cannot use the /OBJECT qualifier to create an
    object module from a command definition that contains the IMAGE
    keyword.

    You can specify only one command definition file when you use SET
    COMMAND/OBJECT.

    If you specify the /OBJECT qualifier and omit the file
    specification, output is written to the default device and
    directory; the object file will have the same name as the input
    file and a file type .OBJ.

    You cannot use the /DELETE, /OUTPUT, /REPLACE, or /TABLE
    qualifiers in /OBJECT mode.