A Revit coordination tool that copies elements (like grids and levels) from a linked model into the current one, then flags an alert if the original later moves out of sync. A structural engineer commonly uses Copy/Monitor to bring the architect's grids and levels into their own model rather than redrawing them by hand - and if the architect later shifts a level's elevation, Revit flags the discrepancy automatically instead of the two models silently drifting apart.