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-<h2>Implementing Atomic Command Sequences</h2>
-<p>
-In Proof General, the blue region of a script buffer contains the
-initial segment of the proof script which has been processed
-successfully. It consists of atomic sequences of commands
-(ACS). Retraction is supported to the beginning of every ACS. By
-default, every command is an ACS. But the granularity of atomicity
-should be able to be adjusted.
-</p>
-<p>
-This adjustment is essential when arbitrary retraction is not
-supported in the prover. Usually, after a theorem has been proved, one
-may only retract to the start of the goal. One needs to mark the proof
-of the theorem as an ACS. At present, support for these goal-save
-sequences has been hard wired. No other ACS are currently
-supported. We need a generalisation to overcome this deficiency.
-</p>
-<p>
-This improvement should allow support for Coq's <i>Section</i> command,
-LEGO's <i>Discharge</i> and simplified support for Isabelle/Isar,
-by removing some of the prover-specific code.
-</p>
-<p>
-<b>References:</b>
-Proof General manual
-(<?php htmlshow("ProofGeneral/doc/ProofGeneral_17.html#SEC119","this section","Proof General Manual") ?>), and proof assistant manuals.</p>
-<p>
-<b>Skills:</b>
-Good Emacs Lisp, understanding of "granularity" problem
-for proof assistant history mechanisms.</p>
-<p>
-<b>Proposer:</b>
-<a href="http://zermelo.dcs.ed.ac.uk/~da">David Aspinall</a>
-(based on an original idea by Thomas Kleymann).
-</p>
-