Vista Tutorial - Context Menu Telephone Dialer ?

I want to be able to do something absurdly simple - to highlight any
numerical string anywhere on my Vista PC, right click on it to bring up a
context menu including the item "Dial", to select "Dial" by left clicking on
it and find that I am being connected to that telephone number. I feel it
must be dead easy to set Vista up to do that but seem to be too dim to
figure it out - please help.

(I have the facility to do that from within AZZ Cardfile 4 beta-C, but would
like to be able to do it from anywhere.)