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drop_anchor ([type])

     Usage: Start marking a block at the cursor position.  Marks are
            kept on a LIFO stack, so multiple marks are allowed. Be
            sure to raise each mark to avoid gobbling up memory with
            the stack. Only the most recent mark in the current buffer
            is displayed as the "marked area".

Parameters: Type .int. determines the type of mark:

                        1         Normal
                        2         Column
                        3         Line
                        4         Noninclusive

            If omitted, a normal mark (type 1) is used.

   Returns: Nothing