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copied!<p>I'm not really sure if this is a wise thing to do, but anyway. </p> <p>Here is a schematic solution for two Notebooks. It may be generalized, but it's not straightforward. </p> <ol> <li><p>Open two Notebooks</p></li> <li><p>In each of them go to the menu (evaluation -> Notebook's default context -> Unique to this Notebook) With this, the symbols are not shared anymore.</p></li> <li><p>In each Notebook enter something like <code>Context[]</code> to get the Notebook Context</p></li> <li><p>Now in each Notebook enter the following code </p></li> </ol> <p>. </p> <pre><code> Needs["Experimental`"]; SetAttributes[f, HoldFirst]; f[s_, val_] := ToExpression@StringJoin["Notebook$$17$799580`", ToString@Unevaluated@s, "=", ToString@val]; ValueFunction[t] = f </code></pre> <p>Where the <code>Notebook$$17$799580</code> is the context of THE OTHER Notebook (this should be able to be obtained "automatically", but this is a proof of concept only. </p> <p>Now when you want to share a symbol enter </p> <pre><code> f[symbolToShare] </code></pre> <p>That's it. </p> <p>You may share the value bidirectionally, or just in one direction, entering f[x] only in the Notebook you want as source value for x. The other Notebook will get the updated value, but it'll not update it back. </p> <p>HTH!</p> <p><b>Edit</b> </p> <p>Towards automation: </p> <p>You may get all other open Notebook Contexts to update your shared symbols as: </p> <pre><code>ctxs[]:= Complement[Contexts["Notebook$$*"], Flatten@Union[{Context[]}, StringCases[Contexts["Notebook$$*"], __ ~~ "Private" ~~ __]]] </code></pre> <p>So your f will become something like this (not tested)</p> <pre><code> f[s_, val_] := ToExpression@StringJoin[#, ToString@Unevaluated@s, "=", ToString@val]&/@ctxs[]; </code></pre>

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