FILE management in Survo: 1 = General information 2 = FILE CREATE, FILE MAKE (creating a data file) 3 = FILE SHOW, FILE EDIT, FILE MEDIT (input and editing of data values) 4 = FILE ACTIVATE, FILE MASK (selecting active and protected fields) 5 = FILE STATUS (displaying the structure of the data file) 6 = FILE UPDATE (defining more variables, for example) 7 = FILE LOAD (copying data file in edit field or text file) 8 = FILE SAVE (copying text file in data file) 9 = FILE COPY, FILE SELECT, FILE EXPAND (copying data files) S = FILE SORT (sorting observations) I = FILE INIT (adding missing observations) A = FILE AGGRE (combining observations as sums or means) B = FILE AGGR (conditional statistics within aggregates) D = FILE DEL (deleting a data file) C = FILE REDUCE (deleting fields and observations) V = VAR (transformation of fields/variables) R = Representation of statistical data E = General information on Survo