A method is disclosed for performing message interactions in a multi-tab application program. The method includes creating one or more page windows corresponding to respective tabs in the multi-tab application program as one or more top-level windows and receiving an input message corresponding to a user operation with respect to a particular tab. The method also includes sending the input message to one of the page windows corresponding to the particular tab by a main frame window of the multi-tab application program in a non-blocking message sending mode, without sending any associated system message to the page windows. Further, the method includes continuing to handle messages for other page windows by the main frame window regardless whether the one of the page windows is hung.