The old DevNet content can be found on the Tech Support website under the Troubleshooting section. See Ahmad's comment hereRe: Tools and utilities developed by OSI Developer's Network (OSIDN)
I think you're looking for the add-in called "Copy Cursors". From the description:
The Copy Cursors copies the cursors from the selected trend to all of the other trends on the display at the selected time. This ProcessBook add-in requires no configuration.