posted by Nelly .
How to integrate / combine two different programs together ??? :/
Use a text editor!
Seriously, it depends on the programming language, and the structure of the individual programs. If they are independent of each other, then you just need to make sure that each is available to the user. If they are interconnected, you need to sort out the logic, and especially the data flow.
In other words, it is a case by case answer.