IN is a compound function in Model 1, created by the combined activity of Si->Ne or "Si in service to Ne." IN has the same general attitudes as Ni (I+N), but is coming from Si-Ne's metabolism. IN is the sub-primary function of the SiFe and SiTe types and is present in all Alpha and Delta types.
The IN compound is produced when Si, as a worldview function, is used to archive a series of modular Ne associations, such that they chain together into a longer and persistent array. What results is an association chain that can cut across large domains of life, while nonetheless lacking the convergence and isomorphism of Ni. When Si's entire repertoire of datasets is put to the service of Ne's endeavor to link together objects, what results is the ability to create a wide-spanning and unbroken link of datasets, correlated by their associations (Ne) rather than their local (Si) features. This allows Si-Ne users to form thematic strands that span various aspects of life, as one very long Ne association that is not happening in real-time. Instead, this long Ne association chain is temporally persistent, allowing it to be referenced in the future as well. However, these association chains will differ from those of Ni, which links together datasets not only by a partial intersectionality, but by a holistic isomorphism to some fundamental shape. The threads of Ni converge together datasets only when an entire shape/symbol is present, while IN's links are not constrained by that isomorphism. The shape of the IN association chain will instead be open-ended and able to vary wildly, so long as it continues to tie together more objects into a longer association. In this way, IN remains divergent, even though that divergence can tie a very long string of datasets together.
The following are behaviors commonly manifested by Si in service to Ne.
When Si helps bind together a series of Ne associations into a long array, this array itself will have a finite range; a discrete start and end. Even if the array cuts across twenty or thirty points, it will still constitute an ultimately localized set of intersections which will not permeate across all of Si's worldview in the way Ni's threads do in an Ni worldview. With Se-Ni users, every experience of life is woven, consciously or unconsciously, into one absolute informational convergence. The threads of Ni are non-discrete, but glide from one to another, as though the entire web was made from one single thread -- so that the end can be reached from the beginning. While it is true that for an Ne-Si user everything can be associated, in principle, this is different than experiencing every moment in life as a direct or indirect immanence of a unified, trans-planar web. Oppositely, for Ne-Si the act of building this associative chain happens proactively (Ne), by the inventive addition of more pieces, rather than by a reactive geometric convergence in Ni.