What are alternative ways to launch my app?

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http://stackoverflow.com – I can launch my app by: 1) tapping on it's icon in launcher 2) registering "visible" intent-filter (I mean - user clicks for example "Send with.." then chooses my app) 3) entering numeral code in dialer and "call" - "invisible" intent, user cannot choose app, he just enters code 4) ...? 5) ...? Are there any other ways to launch my app? (I'm mostly interested in something else like "invisible" intent from paragraph 3) P.S.: Assume that we have clean device only with default system apps (most popular of Google apps are also counted as default) and my appP.P.S.: Ways for usual users ar (HowTos)