Hi,
  Z order method is the use of the show the design of the
output form to use z order technique.
z order technique is Show view of the Z corner to print the
z style.
Z order is Access the data in the two dimension Array to
access data
Ex:
1234
5678
9065
 call Z order method to pass order For ex: pass 3
then output is
1396 to Access four corner of the z order

Thank & regard

Z - Order Methon Useful for the sending the forms like 
Front-to-back and Back-to-Front

Thanks 
T Srinivasa Reddy

z-order is the stacking order for controls and you can set 
control's z-orders with the zorder Method.
Places a Specified MDI form,form or control at the front or 
back of the z-order within it's graphical level.
Syntax:Object.zorder  position.

e.g Here in one form,2 picture boxes are there,picture1 & 
picture2.In a form Picture2 is on top of picture1.When the 
user clicks on the form,we can move picture1 to the top 
with the zorder Method.

          Private sub form_click
                 picture1.zorder 0
          End sub