Select multiple objects

Hello,

I wrote this script that draws a box on the screen with the mouse, like RTS games. How can I select every object that is inside this box?

In other words, how can I access these objects and change their variables?

 #pragma strict

 var MenuSkin : GUISkin;

 private var clickPosX : float;
 private var clickPosY : float;
 private var CurPosX : float;
 private var CurPosY : float;
 private var drawing : boolean;
 
 function Update() {
     if(Input.GetMouseButtonDown(0))
     {
         drawing = true;
         clickPosX = Input.mousePosition.x;
         clickPosY = Input.mousePosition.y;
     }
     if(Input.GetMouseButton(0))
     {
         CurPosX = Input.mousePosition.x;
         CurPosY = Input.mousePosition.y;
     }
     if(Input.GetMouseButtonUp(0))
     {
         drawing = false;
     }
 }
 
 function OnGUI() {
     GUI.skin = MenuSkin;
     if(drawing && clickPosX != CurPosX)
     {
         GUI.Box (Rect (clickPosX, Screen.height - clickPosY, CurPosX - clickPosX, Screen.height - CurPosY - (Screen.height - clickPosY)), "");
     }
 }