 
  H = BTKREADACQUISITION(FILENAME) returns the handle H of a biomechanical 
  acquisition stored in file FILENAME.  This handle is returned 
  as a double and can be only used with the btk* function.

  The release of the memory associated with the handle H can be done automatically
  by Matlab when you use the command 'clear all', or you can use the function
  BTKDELETEACQUISITION.  The use of the function BTKDELETEACQUISITION is greatly
  advised when you are doing batch processing as Matlab does not ma