Control for movable rail

A covering for an architectural opening, comprising:

• a first horizontal movable rail having a left end and a right end;
• an extendable covering material connected to said first horizontal movable rail, wherein movement of said first horizontal movable rail upwardly and downwardly extends and retracts the extendable covering material;
• a second horizontal movable rail below said first horizontal movable rail;
• first and second lift spools positioned on said second horizontal movable rail for rotation together;
• a first lift cord extending from a first fixed point above said first horizontal movable rail to said first lift spool;
• a second lift cord extending from a second fixed point above said first horizontal movable rail to said second lift spool;
• an elongated rod positioned on said first horizontal movable rail and extending in a left-to-right direction;
• and
• first and second windlass spools coupled to said elongated rod for rotation therewith, said first lift cord wrapping around said first windlass spool and said second lift cord wrapping around said second windlass spool;
• wherein;
• said second horizontal movable rail is suspended on said first and second lift cords and rotation of said first and second lift spools causes said first and second lift cords to wrap onto and off of said first and second lift spools to raise and lower said second horizontal movable rail;
• and
• wherein said first horizontal movable rail is suspended on said first and second lift cords and rides up and down on said first and second lift cords to raise and lower said first horizontal movable rail independently of said second horizontal movable rail.