When you work on a workshared project, you specify an active workset. Each new model element you add to the project is then contained in the active workset.
View-specific elements, such as annotations and dimensions, are placed in the workset for the current view.
When using a workshared project, you can edit individual elements, or you can edit worksets. When you check out an individual element or a whole workset, the elements are visible to other users but are not editable by them until you relinquish the element or workset.
To check out an individual element, borrow it. To check out a workset, make it editable.