change ip and start program script!!??

One of the AppleScript Help Modules is Open Transport (Networking) which includes information and 42 example scripts for creating, activating, and deleting configurations for TCP/IP, AppleTalk, Modem, Infrared, Remote Access, etc.
And then to start a series of programs one method is to tell the Finder to open the application file(s) and they launch as tho double-clicked.

tell application "Finder"
open alias "Mac HD:Applications:Cool App:Cool App 1.0"
open alias "Mac HD:Applications:Another Cool App:Cool App 2.0"
end tell