You can open the addin as a file just like an ordinary XLS.
This is more work for your users, but can be useful if the addin is not in
constant use and slows down Excel opening.
Another problem with networked addins is that you cannot easily update them
whilst they are in use.
Try it out on your system to see if you get any significant speed impact
from placing the addin on the newtwork, if you find its slow there is an
automatic reversioning addin loader on my downloads page which is designed
to solve these problems.
hth
Charles
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Decision Models
The Excel Calculation Site
www.DecisionModels.com