Using the Share Project Manager
Use Share->Manage Shared Project in the main menu to open the Shared Project Manager. In this dialog, you can see the current status of items in the shared project such as which team member has which pages or masters checked out.
Clicking the Refresh button will retrieve the current status of pages, masters, and document properties of the shared project.
You can also right click on an item or selection to check in, check out, and get the latest changes.