The string array is stored as memo in category submode.
The memo is addressed with its number (SAVEMEMO) or with a filepointer.
If the parameter nr or the filepointer FP equals to -1, then a new MEMO is created, which stands then as the first MEMO in the category.
If nr is a non-negative number or FP points to an existing memo, then SAVEMEMO overwrites the existing memo. If not all elements of the array shall be stored, the number of lines has to be given as parameter lnr.