# Attributes Tab The **Attributes** tab is displayed by default at start-up. It contains all attribute information for the selected item or items that was provided during the building process, whether from the authoring system or the UDiTH SDK. - Double-click an attribute value to copy it to the clipboard for further use. - Drag an attribute into the main window to turn it into a comment. - Right-click an attribute and then select **Add to search filter** to restrict the search to that attribute in the search filter window. The information shown in the Attributes tab includes: - The number of objects you have selected. - A list of links for the selected object or objects. - All attributes of the selected object or objects. > In the **Settings** tab, you can choose whether empty attributes are shown or hidden. For `FileName > Equipment`, **Equipment** is displayed. When a value, such as the one in the **Name** field, can be edited, the following colours indicate the field type: - **White** for **read-only** fields - **Light yellow** for **editable** fields - **Dark yellow** for **custom** attributes ## Links The upper part of the **Attributes** tab displays the links attached to the selected object. You can attach links to websites, local and cloud-based documents, images, and external systems, depending on the available API. > Due to security reasons, links to executable programs and scripts are not possible. > Documents are opened with the standard application defined in Windows for the corresponding file type. If a link between the 3D model and the P&ID has been established, a link to the associated objects in 3D is displayed. Clicking this link in UDiTH selects the corresponding objects in the 3D model and centres the view on them. A linked 3D object also includes a link with the name of the P&ID in its attributes. This allows you to switch easily between the P&ID and 3D views for linked objects.