Minisoft Corporation and Pear, Inc., are the two largest computer companies in the United States. Pending Department of Justice antitrust review, the two corporations plan to merge, renaming their company Mini-Pear, Inc., As an integral part of the merger, existing shareholders of Minisoft Corporation and Pear, Inc. will be offered an even stock swap. Per the terms of the proposed trade, current shareholders of Minisoft Corporation and Pear, Inc., will exchange each share of their company's stock for one share of Mini-Pear, Inc., stock. A few shareholders of both Minisoft Corporation and Pear, Inc., do not approve of the terms of the proposed merger, nor do they approve of the merger itself. The vast majority of shareholders of the companies approve of the merger.

What rights do these shareholders have, either in terms of blocking the merger or in terms of estimating the fair value of their existing shares?