When I hit a bundles list command on the dm shell it shows as follows

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43 com.springsource.osgi.webcontainer.core 1.0.0.M1 ACTIVE
44 S com.springsource.osgi.webcontainer.tomcat 1.0.0.M1 ACTIVE
45 S com.springsource.server.web.core 2.0.0.RELEASE ACTIVE
46 com.springsource.server.web.dm 2.0.0.RELEASE ACTIVE
47 com.springsource.server.web.tomcat 2.0.0.RELEASE ACTIVE
48 com.springsource.javax.annotation 1.0.0 ACTIVE


[code]

What does 'S' - stand for ?