The Dink Network

&return returns the value of the last thing you did, basically... eg, these are identical:

int &sprite = create_sprite(123, 456, 3, 21, 1);
sp_script(&sprite, "duck");

create_sprite(123, 456, 3, 21, 1);
sp_script(&return, "duck");

Useful for things like that but keep in mind it will change for just about anything, so this will not work:

create_sprite(123, 456, 3, 21, 1);
sp_script(&return, "duck");
sp_size(&return, 150);

Because the &return in sp_size is now the script number of duck.c, not any more the sprite number. It would be like this:

int &sprite = create_sprite(123, 456, 3, 21, 1);
&sprite = sp_script(&sprite, "duck");
sp_size(&sprite, 150);

And about the brains, yes what Toasty said. I went up to brain 72 I think, doesn't affect the behaviour. You'd have to use normal brain 9 or something if you needed it to move around etc properly though I'd imagine, not sure.