The Who am I command is used to find out who is currently logged on to the workstation and, if a schedule is being run, the name of the user running the schedule. 

The example calendar window below shows the schedule icon in the bottom left corner which indicates that a schedule is currently being run on the "DMS" dataset.  To find out who is running a schedule, you can use the File | Who am I from the calendar's General menu as in:

A pop up window will appear similar to the example below telling you the user name logged on to this workstation and, if a schedule is being run, the name of the user running the schedule.  In the example below, the workstation is currently logged on as "Peter Cox"  and "Admin" is running a schedule on "DMS Sample". 

If a schedule is not being run, the pop up windows appears as: