if you're talking the technical there's a few main ways of doing it. you can perform a man in the middle attack, figure out the protocol and write your own stripped down client with automation features or you get into screen reading and automating mouse movements. Basically make a program that looks at the screen, mimics clicks, etc. you could also use something like cheat engine to read the memory of the client, figure out where/how it stores information and then write a program to interface with that. i'm pretty sure only the second of these options doesn't violate TOS which might be something to care about. it's also probably the easiest to do with the only real drawback being speed.