It is possible to tag multiple objects as belonging to the same SSS 'set' so that illumination will blur across object boundaries. A common use case might be blurring between teeth and gum geometry. It is enabled by adding the constant STRING userdata sss_setname to the same value on the objects in the set.
Below is a simple example scene rendered in Maya:
The renders below show an XGen primitive that has been rendered with and without shareSSS. Note that the XGen archive was exported with shareSSS prior to adding it to the XGen description.