Stacking
========

One unit may STACK under another unit.  Two or more units
grouped in this way are referred to as "a stack".

Stacks move together and fight together.  Here is a stack of
four units:

           Law Netexus [2020], accompanied by:
              Feasel the Wicked [1109]
              Drakkar the Trader [1752]
              Alion Krysaka [2785]

Law Netexus is the stack leader, the top-most unit in the stack.

Only one level of stack depth is shown, so all that can be determined
from the location report is that Feasel, Drakkar and Alion are
stacked somewhere beneath Law Netexus.  The exact arrangement of
stacking bonds is not shown.

Feasel might be stacked under Law Netexus, with Drakkar and Alion
under Feasel.  Or Feasel, Drakkar, and Alion may all be stacked
directly beneath Law Netexus.

Generally, such internal arrangements are only important when
the stack breaks up.  If Drakkar is stacked beneath Feasel, he
will stick with Feasel if Feasel drops out of the stack.  But
if Drakkar were stacked beneath Law Netexus, he would not follow
Feasel if Feasel unstacked.

If Law Netexus issues a MOVE order, the entire stack will move.
If, however, Feasel issues a MOVE order, he will first drop out
of the stack before moving.

Similarly, if Law Netexus engages combat with the ATTACK order,
all characters in the stack will fight together.  If one member
of the stack is attacked, the entire stack will respond in defense.

Multiple levels of internal stacking can be useful if one wants
several stacks to join together for a while, but then split apart
later into their old arrangements.

Ocean ships may not be stacked together.  There is no way to cluster
ships into a fleet.