You could say this blog has a defined purpose, which is teaching computing.

(It's quite to the point that it's purpose is teaching me computing.)

(Teaching other people computing is very much on purpose, since my sense is that will go a long way towards teaching me computing.)


This blog does have a more general purpose, very much assigned, which is to act as a portal.

In the case of portals, any purpose native to the portal is ancilary to the purpose of the portal.

A portal can be described, even defined, as a place (on a web/matrix) from which many places can be seen.

This is interesting: it is characteristic of the web that we cannot see it. We can only see individual places on or in it. However, a place on the web can show us representations of other places on the web. It then becomes a portal.