You're either talking about G1's launcher, APB's launcher, Steam, or launchers in general. Three out of 4 I have talked about, you keep telling me I need to read, sorry but read fookin what?
You only mentioned an "application to start an application" and I am the one causing miscommunication? Give some clarity about what you're trying to say if you phrase it ever so poorly or create a context where a reader could extract it from. In case you try to bash on steam, LO and G1 before them alike are only half balling it on steam. Otherwise you'd have the comfort of auto-updating etc, which causes them to keep their own launcher and updating services (Even though steam offers better service there, for free).
Unless you're joking about using any form of OS, you have lost me and it annoys me because it reminds me of talking to all knowing teenagers which can say anything without saying anything. E.g. You know, the stuff! Gawd.