Library /sys$common/syshlp/pca$help.hlb CANCEL, SOURCE, Qualifiers, /MODULE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /MODULE=module-name

    Specifies that the directory search list for a specific module
    established with a previous SET SOURCE/MODULE command be
    canceled. This qualifier should be used only if the module-name
    module has its own specific directory search list.