How to interconnect independent modules

How to interconnect independent modules

[Pablo]

Hi people.
I have a main file called Main which access a library called Mylib
using a method called Mymethod: Mylib.Mymethod (Parameter1, Value),
been Parameter1 a list of parameters defined in Main and Value could
be a float. I have a GUI client application which accesses tasks
initiated in Main but the data from Mylib and plots some stuff from
these data.
But I created a new service application, which is a new main file
called Secondary which imports the same library Mylib and uses it
according to Mylib (Parameter2, Value). Parameter2 is a list of
parameters defined in Secondary but not in Main and I have the
restriction of I must not modify the main file Main to include these
new parameters (but the library Mylib works independently with both).
My problem is: I need the data passed from Secondary through Mylib
appear in my GUI client application.

So anyone can help me?
Thanks very much.