USE is the jCommon module of jLab.

 USE  Copies structure fields into named variables in workspace.
 
    USE STRUCT, where STRUCT is a structure, copies all fields of the form
    STRUCT.X into variables named X.
   
    This is useful for handling multiple datasets with the same variable
    names.  The structures can be then kept in memory and 'mapped' into
    variables as needed.
 
    See also MAKE, MATSAVE.
    __________________________________________________________________
    This is part of JLAB --- type 'help jlab' for more information
    (C) 2000--2015 J.M. Lilly --- type 'help jlab_license' for details