Abstract: Provided is a method of dynamically providing a layout during a runtime of an application programming interface (API)-based application, including: transmitting, from a user device to a service server, user authentication-related information and an access request; requesting, by the service server, an API server to generate a token; transmitting the token generated by the API server to the user device via the service server; transmitting, by the user device, the token to the API server; and providing, by the API server, layout information to the user device.

Abstract: Provided is an action based shared screen recording method including providing a video call screen to a plurality of users, providing a shared screen to display one or more documents separately from the video call screen, reflecting and displaying a document manipulation performed by at least one of the plurality of users based on the displayed document, and recording in real time the shared screen reflecting the document manipulation, wherein the shared screen is recorded based on action information generated based on the document manipulation of the at least one user.

Abstract: Provided is a method of synchronizing a plurality of user terminals based on peer-to-peer (P2P) communication, the method including occurring a first state change in a first user terminal, generating first action information corresponding to the first state change in the first user terminal, transmitting the first action information from the first user terminal to a second user terminal, receiving the first action information in the second user terminal, adding the first action information to an application ready queue in the second user terminal, detecting whether a divergence or a causality violation occurs in the second user terminal, and applying a state change based on the first action information in the second user terminal.

Abstract: Provided is a method of synchronizing a plurality of user terminals based on peer-to-peer (P2P) communication, the method including occurring a first state change in a first user terminal, generating first action information corresponding to the first state change in the first user terminal, transmitting the first action information from the first user terminal to a second user terminal, receiving the first action information in the second user terminal, adding the first action information to an application ready queue in the second user terminal, detecting whether a divergence or a causality violation occurs in the second user terminal, and applying a state change based on the first action information in the second user terminal.

Abstract: Provided is an action based shared screen recording method including providing a video call screen to a plurality of users, providing a shared screen to display one or more documents separately from the video call screen, reflecting and displaying a document manipulation performed by at least one of the plurality of users based on the displayed document, and recording in real time the shared screen reflecting the document manipulation, wherein the shared screen is recorded based on action information generated based on the document manipulation of the at least one user.