you may create a var and define
f.e.
var number_var;
define number,skill1;

then each time you create entity (player) add +1 to number_var;
something like:

number_var +=1;
you = ent_create(bla,bla,bla)
you.number = number_var;
so every player will have his own number skill

then if(you.number == 5){show me your position;}
like:
var avatar_pos[3];
if(you.number == 5){vec_set(avatar_pos,you.pos);}
it means...
avatar_pos.x = you.x;
avatar_pos.y = you.y;
avatar_pos.z = you.z;