My "Shaw" prefinished floor is 10yrs old, the finish near the entry door and around the kitchen table is pretty worn. I'd like to do something with it before the finish is gone and the wood itself is scratched. Anyway I can top coat it?
It would be nice if I could just finish the bad area, but I doubt I could match the sheen. Ideas? Thanks

Clean the floor with hardwood floor and laminate cleaner. While it is wet you will see the color that the floor will be after you apply a coat of finish.
Water-based poly-urethane will provide a protective surface. You may need two coats. One over the worn area and then another over the whole floor, to get a uniform shine.
Follow the directions on the label.

Wouldn't the original finish have been oil based? Will a water based redo look the same in the worn spots?

Regular oil based poly will become yellow over time and as it wears off will become less yellow as the old film gets thinner.
I recommend water based finish because it sticks to old finishes with less chance of peeling when applied by a non-proffesional. As seen after the surface becomes wet after cleaning, the non-ambering water base will show an accurate color when coated, no matter how many coats of finish are applied.
With modern water based finishes becoming more resistant to wear, this should be the maintenance coat of choice. If a pre-finished floor gets worn, it most likely will not loose any color because of the UV cured finishes that most manufacturers use is more "clear" than the old site finished floors.
A lot of people like the yellow color of the old oil based poly, and there are "amber" water based sealers available for the first coats, which are then protected by clear non-ambering finishes so surface wear don't change the color as the film gets thinner from wear.