In computer science, transclusion is the inclusion of part of a document into another document by reference.
Some hypertext systems … support transclusion. For example, an article about a country might include a chart or a paragraph describing that country’s agricultural exports from a different article about agriculture. Rather than copying the included data and storing it in two places, a transclusion embodies modular design, by allowing it to be stored only once (and perhaps corrected and updated if the link type supported that) and viewed in different contexts. The reference also serves to link both articles.
In schools, transclusion occurs when students memorize (learn) a poem or vocabulary word. Then, in the future, a key word such as a title permits both the speaker and the listener to draw upon the same reference to understand something else in common.
Tablet PCs in schools permit creating, development and exchanging such common understandings.