The present invention provides a magnetic field generator for MRI in which, by simplifying the component parts of the pole pieces incorporated therein, the magnetic field generator for MRI can be manufactured at a lower cost without detracting from its magnetic characteristics. The method allows to search in a mail-attachment connection table all the attachment locations that are in relation to the e-mail where the attachment is to be attached to or to be detached from and to present to a user all attachment locations that have a relevance for the attachdetach operation. In some embodiments, the list view includes a preview section for displaying a representation of a clip selected from the list view’s list area. A system and method for heating a geological formation are also disclosed.