The Dink Network

Alright, so the way I'd always done in script warping was the way I first saw it (or think so at least) in one of the original scripts. This is something like:

&player_map = 2;
load_screen();
draw_screen();

Then I look at one of redink's scripts for simple warping (can't remember why even) and noticed he did this:

&player_map = 2;
load_screen(2);
draw_screen(2);

Now, is there a difference, or does the empty brakets automatically load and draw the current screen, the last change of &player_map? Is this better in any way? Slightly confused, fill me in please