Guess the coding!

It's a simple game really, you don' need to know gml. Basically I'll post a line of coding, in which you guess until someone figures out.
You can only guess once, so you need to make it count, but you can give out two answers.
You can only post one time per question, but you can say two answers on that post.
If no one can figure out what the line of coding means, then I will give out the answer, and no one is awarded any points.
Who ever guesses correctly, is awarded 500 points, if they win in a row then it is doubled.

So, here is the first line of coding!

Code:

x=xstart;
y=ystart;

Right lets see, is it the up, down, left and right commands? You know, Y (up, down) X (left, Right)













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