Compounds of Formula I:and salts thereof, formulations thereof, conjugates thereof, derivatives thereof, forms thereof and uses thereof are described. The fluoro-mode is used to quickly obtain an image which provides confirmation that the selection of MR imaging parameters are proper and to provide an opportunity to adjust these selections. Through these three elements, the ordering logic keeps track of a number of \u201cvirtual queues\u201d corresponding to the data flows. The system may be implemented by highlighting the defined words in the received web document, and responsive to a user interactive selection of a highlighted defined word in the received document, displaying a menu of a plurality of hyperlinks to the located web documents related to the selected highlighted defined word. A stepping motor 13 to drive a collimator lens 16 is mounted on a head base 17 of the optical head 3 and a part of stator 42 of the stepping motor 13 is exposed through an opening 14a of a head cover 14, an opening 15a of a flexible substrate 15, an opening 13a of a cover 41, and an opening 13b of the cover 41.