>I have two files below and each file contains 5 functions
>
>file1.prg
>file2.prg
>
>When I use the commands below
>
>set procedure to function1
>set procedure to function2
>
>Is procedure passed only to function2.prg or to funcion1 + function2 ?

If you would remove the functions from the file1 and file2 and make separate .prg file for each function you do not need set procedure.