A system and method is provided for constructing an internet e-mail add-on service system that can seamlessly operate on the conventional SMTP internet message transport network. A computer-implemented method to coalesce free intervals of a memory may include ascertaining that a first interval of the memory is free. Bi-directional communication is thereby provided between the ground system and specific mobile platforms. Then, observation conditions, which are the same as those used when the image data of the sample has been saved, are automatically restored on an electron microscope on the basis of the observation condition data. The annular projection is axially flexible for bending and folding toward the base wall and toward the at least one annular wall in sealing engagement with the end portion of the container neck finish when such end portion is received between the annular walls.