Information processing system, non-transitory computer-readable storage media, and computer-implemented method

One or more non-transitory computer-readable storage media storing instructions that cause one or more computers that share application image data among users, to perform operations comprising:

• receiving application image data of another user via a server ;
• displaying the received application image data except when the another user is registered as a prohibited sharing target ;
• and
• transmitting application image data, together with user identification data, to another user via the server regardless of the registration.

A computer-implemented method comprising:

• registering user identification data of a user who is prohibited from sharing application image data ;
• transmitting application image data, together with user identification data, to another user via a server regardless of the registration ;
• receiving application image data and user identification data from another user ;
• and
• displaying an image based on the received application image data, except when the user identification data has been registered by the registration.