Hi All,<div><br></div><div>    these two slots are the unused MethodContext and BlockContext prototypes.  They&#39;re either side of class BlockClosure.  I&#39;d like to use one of them for threaded callbacks (the foreign callback process slot, upon which a callback from a foreign thread can be run) and keep another in reserve.  In Smalltalk these are indices 36 &amp; 38 in SmalltalkImage&gt;&gt;recreateSpecialObjectsArray.  Objections, encouragements, alternatives?</div>
<div><br></div><div>best</div><div>Eliot</div>