Data sharing between 2 programs

Hey All,
I am trying to figue out how to pass information from a windows based accounting program to a UPS program ( both windows based) to avoid typing address information in twice. I am thinking about SENDKEY but they might not do the trick. Is there a way to find out the name of fields in programs that you did not write? I can call shell too launch the two programs, but am not sure after that. Any suggestions or code would be appreciated.

Some API is probably necessary - to get the handle of the windows atc.
Do a bit of a search, I'm sure this sort of question has come up before.

:)

See if this does anything for you

Share Data Between Applications