The checkout system helps coordinate scheduling amongst several people. Only one person should work on the schedule at a time. If people are based at different locations, the checkout system makes it easy to ensure that just one person has the schedule open at a time. If someone checks out the schedule, anyone else who tries opening from the web will get a warning that the file is checked out.

Go to File / Open. Make sure your administrator password is in the box at the bottom of the Open dialog. Hit Open from amion. The web site marks the file as checked out. When you've finished making changes, republish the schedule to check it back in.

If you try closing OnCall without having republished the schedule, OnCall asks whether you want to publish, check the file back in without republishing, or leave it checked out.

When you restart OnCall later, it remembers that you were working with the schedule at amion.com. It checks with the web site to see who last published and asks whether you want to re-download or continue working with the local copy from your last session. If you were the last one to publish, working with the local copy saves time and is equivalent to re-downloading.