ISP Information:
This tracks the depth of each triangle in a 3D graphics representation, from the perspective of the viewer, to ensure that objects behind other objects in a scene don't appear until the viewer has them in his or her line of sight. This is why you can't see through walls to what lies behind, but why you can play multiplayer Quake and have people at many different areas in a level.
ISP Glossary:
Hidden Surface Removal - In article , Michael D. Sullivan wrote: Is there some reason this ought to come out of the carriers' profits, if any (or increase their losses), instead of coming from the pockets of the customers who now have the ability to port their numbers?I don't think that anyone objects to the companies recovering the costof these various assessments. What people object to is that theproduct is advertised at one price, but the net total the customerpays is substantially larger. Why aren't these fees just rolled intothe advertised price, just as are other costs of doing business? Theanswer is easy: the low advertised price draws in the customer, andthey hope that the customer will not back out as all these additionalcharges are added in at the time of sale.
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