Can PCA measure shareable images activated "on the fly" with
    LIB$FIND_IMAGE_SYMBOL?

    Yes, if you relink against the image you want to activate. PCA
    uses a structure built by the image activator to find all the
    shareable image information it needs. By relinking the image,
    the image activator will know about the image and LIB$FIND_IMAGE_
    SYMBOL will work.