1. A method comprising: generating a first process for a first document; generating a second process for a second document that is related to the first document; generating a third process for a third document that is related to the first document or the second document; wherein two documents of the first document, the second document, and the third document are included in the other document of the first document, the second document, or the third document; generating, by the first process, a message that includes target content that indicates time data that indicates when the first document loaded, wherein the time data is used after the first document is loaded to determine, at a later time, whether to replace the first document with a fourth document; sending, by the first process, the message to the second process; determining, by the second process, that the third process is to receive the target content within the message; and sending, by the second process, the target content to the third process; wherein the method is performed by one or more computing devices.