You need an attorney in order to be advised of your rights. To answer some of your questions, a deposition is always within the purview of a court action that has already been filed so it is "court ordered." You may be required to attend the deposition but you need an attorney to know what questions you are or are not required to actually answer.
This is not legal advice nor intended to create an attorney-client relationship. The information provided here is informational in nature only. This attorney may not be licensed in the jurisdiction which you have a question about so the answer could be only general in nature. Visit Steve Zelinger's website: http://www.stevenzelinger.com/
Attorney Zelinger has given one of his customary excellent responses. I would simply add that you should be represented by counsel, here, not only for the deposition, but also for the underlying case. You want an attorney at the deposition who can keep opposing counsel in line and make sure that you do not say anything that might damage your position. You are apparently being accused of breach of fiduciary duties and many states have laws that could make you liable for up to three times actual damages. You do not want to mess around by trying to save a few $ and not take this seriously. You are in way over your head and you need legal help, right away.
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Attorneys Frederick and Zellinger have provided you with good advice. You need counsel to represent your interests in the action.
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