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==== Articles in two different categories ====
One of Wikipedia's most requested features is "category intersection"—the ability to get a list of all articles that fall into two or more categories. Wikipedia still lacks that ability, but you can find it at an off-Wikipedia page called CatScanPetScan at http://toolspetscan.wmflabs.org/catscan2/catscan2.php. '''Figure B-12''' shows how to use it to find, for example, baseball players that have been members of both the [[Seattle Mariners]] and the [[Washington Nationals]]. When you search for articles by category using CatScanPetScan, you can choose how many levels of sub- and sub-sub-categories you want to search. This search shows a depth of 3, butmeaning sinceup thereto were3 levels of subcategories will be searched. (In this case, [[:Category:Seattle Mariners players]] has no subcategories, and [[:Category:Washington Nationals players]] has only one subcategory, [[:Category:Montreal Expos players]], which has no subcategories, so the results are onlyequivalent forto a depth of 1). But ifIf you were using the category ''[[:Category:Architects|Architects]]'' instead, you'd see results in subcategories such as ''[[:Category:American Architectsarchitects|American architects]]'' (level 2) and ''[[:Category:Architects from Cincinnati|Architects from Cincinnati]]'' (level 3). [[File:Wikipedia-ThePetScan Missingsports Manual_I_mediaobject_d1e29745players.png|frame|center|'''Figure B-12''' When you search for articles by category using CatScan, you can choose how many levels of sub- and sub-sub-categories you want to search. This search shows a depth of 3, but since therewas wereonly noone level of subcategories, the results are only for a depth of 1. But if you were using the category ''Architects'', you'd see results in subcategories such as ''[[:Category:American Architectsarchitects|American architects]]'' (level 2) and ''[[:Category:Architects from Cincinnati|Architects from Cincinnati]]'' (level 3).]]
{{WTMM-warning|When using CatScanPetScan, capitalization—except for the very first letter—is critical. For example, in '''Figure B-1312''', if you had searchsearched on the category "Seattle Mariners Players" instead of "Seattle Mariners players," you'd have gotten no matches.}}
==== Searching for categories ====
You can search for categories using the standard Wikipedia search engine by modifying the "Search in" box showni n '''Figure B-3''' (see [[#Searching Wikipedia|the section about searching]]). However, external search engines often have additional options, so it may be better to use one.
External search engines often have options that Wikipedia's search feature lacks, as discussed on [[#Searching Wikipedia|earlier in this chapter]]. When you use an external search engine, you simply restrain your search results to Wikipedia pages and apply any other options you like. If you use Google, for example, you can search just Wikipedia category pages by typing ''site:en.wikipedia.org/wiki/Category'' in the search box. '''Figure B-13''' shows how to use this site restriction in Google. This Google search restricts results to category pages, since "site:en.wikipedia.org/wiki/Category" was typed into the search box. It furthermore requires that the title of the category page contain the word "spy"; note "intitle:spy" at the beginning of the search term. There are 16 categories with "spy" in the title. Searching for "spy" instead of "intitle:spy" would turn up category pages with "spy" anywhere on the page (of which there are about 500).[[File:Wikipedia-The Missing Manual_I_mediaobject_d1e29765.png|frame|center|'''Figure B-13''' This Google search restricts results to category pages, since "site:en.wikipedia.org/wiki/Category" was typed into the search box. It furthermore requires that the title of the category page contain the word "spy"; note "intitle:spy" at the beginning of the search term. There are 16 categories with "spy" in the title. Searching for "spy" instead of "intitle:spy" would turn up category pages with "spy" anywhere on the page (of which there are about 500).]] ▼
▲External search engines often have options that Wikipedia's search feature lacks, as discussed on [[#Searching Wikipedia|earlier in this chapter]]. When you use an external search engine, you simply restrain your search results to Wikipedia pages and apply any other options you like. If you use Google, for example, you can search just Wikipedia category pages by typing ''site:en.wikipedia.org/wiki/Category'' in the search box. '''Figure B-13''' shows how to use this site restriction in Google. This Google search restricts results to category pages, since "site:en.wikipedia.org/wiki/Category" was typed into the search box. It furthermore requires that the title of the category page contain the word "spy"; note "intitle:spy" at the beginning of the search term. There are 16 categories with "spy" in the title. Searching for "spy" instead of "intitle:spy" would turn up category pages with "spy" anywhere on the page (of which there are about 500).[[File:Wikipedia-The Missing Manual_I_mediaobject_d1e29765.png|frame|center|'''Figure B-13''' This Google search restricts results to category pages, since "site:en.wikipedia.org/wiki/Category" was typed into the search box. It furthermore requires that the title of the category page contain the word "spy"; note "intitle:spy" at the beginning of the search term. There are 16 categories with "spy" in the title. Searching for "spy" instead of "intitle:spy" would turn up category pages with "spy" anywhere on the page (of which there are about 500).]]
You can also use the technique shown in '''Figure B-13'''—finding category pages of interest—before you use the category intersection tool CatScan, to avoid having to guess the exact names of categories that you want to use in CatScan. ▼
▲You can also use the technique shown in '''Figurethis B-13'''—findingsection—finding category pages of interest—before you use the category intersection tool CatScanPetScan, to avoid having to guess the exact names of categories that you want to use in CatScan.
=== Other ways of navigating ===
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