similar or identical items. References made to individual items of a plurality of items can use a reference number with a letter of a sequence of letters to refer to each individual item. Generic references to the items may use the specific reference number without the sequence of letters. [0018] FIG. 1A illustrates a block diagram of a system for providing a computationally efficient human-computer interface for calling other users’attention to content. [0019] FIG. IB illustrates how different portions of the content in FIG. 1A are displayed on different display screens of the different client computing devices for the users. [0020] FIG. 1C illustrates how some of the computing devices of the system shown in FIG. 1A can provide a user interface through which a user interface element can be positioned to represent a location of another section of content to view based on a call for attention. [0021] FIG. 2A illustrates an example of how a user can access and select a menu option in a user interface to request that other users of a multi-user sharing session view content being edited by the user. [0022] FIG. 2B illustrates an example of how a user can select specific users to which the request to view content is to be sent. [0023] FIG. 2C illustrates an example of how a user can identify a portion of content in her or his section for other users to focus on. [0024] FIG. 2D illustrates an example of how a user can determine whether another user editing the same content as the user has previously called others to view the content. [0025] FIG. 3A illustrates an example user interface that displays a user interface element generated to notify a user that she or he is a user that has been requested to view the content being edited by another user. [0026] FIG. 3B illustrates another example user interface that displays a user interface element generated to notify a user that she or he is a user that has been requested to view the content being edited by another user. [0027] FIG. 4 illustrates an example user interface that is displayed after a user selects a user interface element to switch from currently displayed content to content for which the user has been requested to view. [0028] FIG. 5 illustrates an example user interface that enables a reviewer to provide feedback with respect to the content for which they have been requested to view. [0029] FIG. 6A illustrates an example user interface that visually notifies a user of a client device of a section of shared data that currently is receiving a high level of attention (e.g., a