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