Clone object makes a dubplicate of an object, but doesn't share any data with it.
INSTANCE OBJECT
This command will create an instance copy of the object. Unlike CLONE OBJECT, this instance will share
most of the original objects data and be dependent on the original object remaining in existence to hold
such data. Instanced objects do have the ability to hide/show both their limbs and hide/show the object,
independent of the original object. This command is ideally suited to copying large numbers of primarily
static objects such as trees and rocks where the original model data is to remaing largely unchanged.(from help guide)
Athlon 64 X2 4400+, nForce 4 Ultra chipset, 1 gig ddr400 d-channel,Radeon X850XT PE PCI-E,2 WD 74 gig Raptors in RAID