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Often it is desirable to group items so that the user must choose
between a set of default values (toggle) or choose one of several
possible values or types of values (mutually exclusive).  These 
groupings of input/output files, numeric inputs, logical inputs and
string inputs is provided by the "TOGGLE GROUP" and "MUT EXC GROUP"
buttons.  Toggles are discussed first, then mutual exclusion.
Moe complete documentation is available in the KHOROS Manual Volume
II, Chapter 2 on User Interface Specifications.
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Before you can create a toggle of items, those items must first be
created.  A toggle only works between similar items, that is you can 
toggle between sets of -I, -O, -i, -f, -l, or -s items, but these
items can not be mixed within one toggle.  Once you have created the
items that you wish to toggle between, click on the 
"TOGGLE GROUP" button.  This will pop a list of -T or toggle items.  If there
are currently no other toggle items, a template item will be displayed.
Selecting this item will pop up another list, pick the type of
item that you would like to toggle.  This will then pop 
up another list of possible items of that type.  At this point you
can select as many items as you wish to toggle.  Next a list
of selected items is provided, click on the item that you would
like to be the default value.
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The position of the -T line determines the placement of all items
within the toggle group.  This will usually require you to edit
the positions of the items that were placed in the toggle.  In other words,
as soon as you put an item inside of a toggle group, its position will
change.
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Before you can create a group of mutually exclusive
items, those items must first be
created.  A mutually exclusive group works between any mixture of
user interface items, that is any of -I, -O, -i, -f, -l, or -s items.
Once you have created the
items that you wish to group, click on the 
"MUT EXC GROUP" button.  This will pop a list of -C or mutually exclusive
items.  If there
are currently no other -C items, a template item will be displayed.
Selecting this item will pop a list of all possible items that
you may want to include in the mutually exclusive group.  
At this point you
can select as many items as you wish to group.  Next a list
of the selected items is provided, click on the item that you would
like to be the default value.
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There is no explicit position for a -C line, so the placement of the items
within the group is not affected.  But, it is best if you place
items in a -C group close together.
