Description (from LUA 4 Manual: 6.4 I/O Facilities)
"Saves any written data to the given file. If <FileHandle> is not specified, then flush flushes all open files. If this function fails, it returns nil, plus a string describing the error."

<FileHandle>: the handle of the file to flush.
Note: I'm not sure whether this is a string or some other type of element. -Mikail
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