Aspects of a method and system for sharing a single antenna for frequency modulation transmission, FM reception and near field communication are presented. In the measurement method, a drive signal having wave properties is used to excite a transmission grating, and displacement of a measured position in each wavelength is transformed into an initial phase of a time fundamental wave. The disclosure also provides a system for orderly connection of a bluetooth headset controlled by a terminal. The image files of predetermined number being image files that can be reproduced when reproduction is done in the forward andor reverse direction from the image file being reproduced. This is advantageously achieved by implementing a transaction resource interface which acts as a wrapper program or a shell around the prior art file system and which can be accessed by a prior art transaction manager for achieving cooperation and data consistency between the file system and any database, or between two or more file systems.