Dear All,
I am currently doing my college project and daily I come across challenges for example:

How do I make the dos window cover the full screen ?
How do I change the font color in dos ?


I think one needs to access certain libary functions for this. Kindly advice how can I search these solutions by myself.
Kindly don't tell me the code just the logic how to find these functions so that I can help myself.

Thank you,
Vishal