Data Type Text (text field: A type of field whose content is text. Examples include the Task Name and Email Address fields. This field can contain up to 255 characters.)
Entry Type Calculated (calculated field: A field in which the value is determined by Project based on information in other fields. Project may recalculate the value automatically or when you specify, depending on your choice of calculation settings.)
Description The Resource Calendar GUID field contains the generated unique identification codes for each resource calendar in your project. No two resource calendars will have the same Resource Calendar GUID.
How Calculated As soon as you create a new resource (resources: The people, equipment, and material that are used to complete tasks in a project.) in your project, Project automatically creates a resource calendar along with its unique identifier. This identifier is stored in the Resource Calendar GUID field.
Best Uses Insert the Resource Calendar GUID column into a resource sheet when you need to see the unique identifier for each resource calendar. This is particularly useful to help with programming and debugging custom applications in Project.
Example You are creating a macro that references specific resource calendars in your project. To obtain unique identifiers for these calendars, you insert the Resource Calendar GUID column into the Resource Sheet.