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You can remove portlet or gadget applications from a space and the members of this space will not see them anymore. The following code shows you how to remove an application from a space:
public void removeApplicationFromSpace() throws SpaceException {
//Your portlet name
String appId = "SocialBannerPortlet";
String appName = "SocialBannerPortlet1"
String spaceId = "zunSpace";
//get container to get other registered components
PortalContainer container = PortalContainer.getInstance();
//get space service for installing operations
SpaceService spaceService = (SpaceService) container.getComponentInstanceOfType(SpaceService.class);
//install application for the space
spaceService.removeApplication(spaceId, appId, appName);
}