Sharing Data between two 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.

How are you wanting to pass the info? Read textboxes? Place text in textboxes?


I am not clear on exactly what you wanna do.

I want to pass a name and address from one windows textbox ina an accounting program to a windows textbox in a UPS program. I did not write either of the programs so It will have to be an external process. Any suggestions?