OK, try this, which should give you a checkbox that will add the tag
"foobar" to any tiddler already tagged with both "foo" and "bar":
<<forEachTiddler where 'tiddler.tags.containsAll(["foo", "bar"])'
write '"|<<checkbox [["+tiddler.title+"|foobar]] [[]] [[]] [[]]
[[{story.refreshTiddler(\'"+context.viewerTiddler.title
+"\',null,true);}]] >"+">|[["+tiddler.title+"]]|[["+tiddler.tags.join
("]], [[")+"]]|\n"' begin '"|Add the tag foobar|Tiddler Title|Tiddler
Tags|h\n"' end 'count+" tiddlers\n"'
>>
cmari
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