Yes its correct Mr.Clements.
This what u replied " It could be some kind of 'private portal'
kind of tool, so you specify subjects you're interested in, and it searches
for relevant/new/changed/whatever articles".
Search must take place only on prescribed place(only in my account of
wikipedia).
Whether it is possible for me to do this?
What do you mean by "in my account"? Do you mean subpages of your user
page? If so, I think you probably want to make your own website, not
use Wikipedia. Wikipedia is a project to make a free encyclopedia,
anything not related to that project should be done elsewhere.