We can encounter that interesting package sometimes,like GUIKit`,but I don't know how to find those.I can found that package which has been default loaded

Union[Select[GeneralUtilities`SymbolNameContext /@ 
   GeneralUtilities`ExtendedNames[All], StringCount[#, "`"] == 1 &]]


But It's don't include GUIKit`.So how to find those package which have not been default loaded but exist in my local disk?

  • $\begingroup$ You can find source code of many packages if you evaluate SystemOpen@FileNameJoin[{$InstallationDirectory, "AddOns"}] . In the subfolder "Packages" there is also GUIKit package. $\endgroup$
    – Pinti
    Mar 13, 2017 at 13:53
  • $\begingroup$ @Pinti Oh,I find that,so this folder contain all package we can Needs? $\endgroup$
    – yode
    Mar 13, 2017 at 13:56
  • 1
    $\begingroup$ I think Needs looks for packages in all folders listed in $Path. $\endgroup$
    – Pinti
    Mar 13, 2017 at 14:06
  • $\begingroup$ @Pinti Thanks for your explanation,I thinks if you compose it for read,I will accepted that. $\endgroup$
    – yode
    Mar 13, 2017 at 14:07
  • $\begingroup$ at least closely related: 133242 $\endgroup$
    – Kuba
    Mar 13, 2017 at 16:38

1 Answer 1


Needs by default searches for packages in folders listed in $Path.

One of the elements of $Path is also FileNameJoin[{$InstallationDirectory, "AddOns"}] where you can find source code of many additional packages that come with Mathematica but are not part of System context.


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