18. A non-transitory computer-readable medium comprising computer-readable instructions thereon for generating a summary document of an online meeting, the computer-readable medium comprising: instructions to store, in computer memory, at least a portion of screen data representing a previously presented portion of an ongoing online meeting; instructions to capture a plurality of screenshots in response to trigger events, each screenshot i) being based at least in part on the stored screen data and ii) being representable as an image thumbnail, and wherein the instructions to capture the plurality of screenshots are operable to capture each screenshot of the screen data by, at least in part, associating a timestamp with the screenshot, the timestamp indicating a point in time in the previously presented portion of the meeting; instructions to combine the plurality of screenshots, thereby dynamically generating a summary document summarizing the ongoing online meeting, wherein the image thumbnails representing the plurality of screenshots are for facilitating navigating through the summary document while the ongoing online meeting is still ongoing; and instructions to signal for presenting, at a viewer computing device attending the meeting, simultaneously and while the ongoing online meeting is still ongoing, first screen data corresponding to a currently presented portion of the ongoing online meeting and second screen data corresponding to one of the plurality of screenshots in the summary document, wherein the second screen data includes stored screen data from a previously presented portion of the ongoing online meeting, wherein the first screen data is presented picture-in-picture inside the second screen data or the second screen data is presented picture-in-picture inside the first screen data, wherein presenting the first screen data corresponding to the currently presented portion of the ongoing online meeting includes presenting live screen and audio data of the ongoing online meeting, and wherein presenting the second screen data corresponding to the screenshot includes displaying screen data from the previously presented portion of the online meeting corresponding to the point in time in the previously presented portion of the meeting indicated by the timestamp associated with the one of the plurality of screenshots in the summary document.
20. The computer-readable medium of claim 18 , further comprising: instructions to receive an annotation from the viewer computing device attending the meeting; and instructions to add the annotation to the summary document.