Library /sys$common/syshlp/sysmanhelp.hlb SYS_LOADABLE, REMOVE, Parameter  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 product

    A 1- to 8-character product mnemonic that uniquely identifies
    a loadable image. For user-written images this should typically
    contain the string _LOCAL_.

 image

    The file name of the system loadable image you want to remove. A
    file name is the only value you can specify for this parameter.
    Do not specify a device, directory, file type, or wildcard
    characters.