1997 headlight adjustment

How do I adjust the the aim of the headlights on my 97 Jimmy? The only way I can see is via a recessed screw (about 5" down) in the top of the sheet metal above the grille.

Does this adjust only the vertical movement of the headlights? (I want to bring them up a little).

If so, how do I adjust the lateral movement? Is it some special sort of screw slot - i.e., not a Phillips or flathead, but a Torx or something?

Thanks for your help.