Why?
Is your user using two different and co-operative types of input? If so, I would probaby re-think your interface strategy. Complex interfaces are confusing...
or
Is it that you are doing something pretty tricky behind the scenes. I would imagine data navigation of the sorts???? If so, check the "range" and "activecell" keywords. I would imagine you may need to re-think your development platform.
Also, the inbuilt form generator allows you to scroll through records automatically via the arrow keys.