It is possible if you know the name of the filename beforehand.
I have to say though that I am not really sure why you would name such a file an
INPUT to the simulation. Clearly it's a product of the simulation that gets to
be used in the simulation, and not an input. Also I am not sure why you
would need to store the results in a file. Why don't you store the data/results
in an appropriate memory structure and use them from there?
There are no special steps to use the data in a file. The filename
can be a parameter (since you talked about input, I still do not see the point).
You can see how we define filenames as parameters from the wireless
channel temporal input parameter.
After you have the filename you can open/parse/use the file and its data
in your code any way you like.