parallel_doc: Limitations

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### 3.16 Limitations of high- and medium-level functions

For the function handles passed as arguments to netcellfun, netarrayfun, and rfeval, the following limitations currently apply:

- If a handle to a named function is passed, this function must exist on the server machine.
- A handle to a subfunction can not be passed.
- A handle to a private function can only be passed if its file path is the same at the server.
- If an anonymous function is passed, it may not have been defined using `varargin`.

Anonymous functions should be usable as usual, since the function specification sent to the server will include the anonymous functions context.