Usually object libraries are used, where the separate object files are created and stored in the single library file. Anyhow you can also do something like:

df /compile /object:single.obj part1.for part2.for

to combine into one object file.

James

If you're in the DevStudio environment, what I usually suggest is creating a source file which looks like this:

and then create an alternate project which has just this file in it. When you build this, you are concatenating the sources implicitly.

Steve