I haven't seen any discussion about how requesting general help works, either on the boards or on the wiki, so I think it's appropriate to share a recent observation. When you request general help the game will prioritize adding your online allies to the list of helpers before adding random onlines. Every time one of my accounts asks for general help, both of my other accounts get the invite. It makes things easier for those big bosses that you don't want to miss out on, yet still don't want to spend more than 1 RP each to finish off.