Programming In CMD

Just to give you guys an idea of what I am trying to do. I want to make some simple programs using Command Prompt in Windows Vista. No, this is not a problem I am having with the OS. What I am trying to do, is to write a simple program that allows me to run IPCONFIG test for whatever computer this program is on. However, I need to know if there is a way to capture the IP address of the computer. So that it can be retrieved by the program and used to ping the local machine of the system?