i'm afraid i wasn't specific enough.
I know that if you are scrolling down through a list of objects, such as
folders or files in windows explorer, pressing the ENTER key will open the
selected item (or do the default operation for the application). you cannot,
however, use the ENTER key to open an object that has not yet been selected,
and you can't select an item by putting your cursor over it and pressing
ENTER.
ditto for the key with no name that "dislays the shortcut menu for the
selected item", which is what a right click does in most situations (ALT
ENTER does the same thing, as well as SHIFT F10).
if you can use a mouse, you can both select and open most items with a
single click, for example a link on a web page or in help. in all cases you
can at least select an item, which you cannot do by positioning the pointer
over an it and pressing ENTER.
given this problem, the "mouse keys" functionality is of little use. you
still have to have a mouse, just so that you can use the mouse buttons.
(i found that pressing the mouse buttons without holding the mouse tends to
make it wiggle, often moving the pointer from the place where i have so
carefully positioned it using mouse keys. however i fixed that problem by
covering the laser with tape.)
i know that it is often possible to select items such as web links by
pressing TAB many times, but this is tedious, unpredictable, and sometimes
doesn't work at all. anyway, that is an alternative to using pointers, not a
way to make the mouse keys pointer functionality useful.
i think i shuld just buy a special keyboard that has a mousepad.
btw, i have been using that list of keys you refer to and it has been very
helpful.