VMS Help STOP, Parameter  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 process-name

    Requires that the process be in your group.

    Specifies the name of the process to be deleted. The process name
    can have from 1 to 15 alphanumeric characters. If the process-
    name includes spaces or lowercase letters, enclose the name in
    quotation marks (" ")  to preserve the correct spelling.

    The specified process must have the same group number in its
    user identification code (UIC) as the current process; you cannot
    use the process-name parameter to stop a process outside of your
    group. To stop a process outside of your group, you must use the
    qualifier /IDENTIFICATION=pid.

    The process name is incompatible with the /IDENTIFICATION
    qualifier; if you use the /IDENTIFICATION qualifier, the
    process name is ignored. If you include neither the process-
    name parameter nor the /IDENTIFICATION qualifier with the
    STOP command, the image executing in the current process is
    terminated.