Unlike many other optical software,
FRED
has a multiple document interface like Microsoft Word and Excel.
This allows the user to have multiple
FRED
documents open at once; entities may be copied and pasted from one
FRED
document to another.
This powerful feature allows the user to develop subsystems as separate
FRED
documents to be merged at a later time. Users can copy subassemblies,
multilayer coating prescriptions, scatter models, refractive media, etc. by simply dragging and dropping between
FRED
documents. (For example, users can create a
FRED
library document that contains all of the coatings, scatter models, etc. that are commonly used at their company, and then simply pass it around and
copy what they need from it.)

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