Abstract: In a consumable-supplies purchase order method for a system including a customer equipment and a purchase-order processing apparatus connected via a communication network, a consumable-supplies condition detection unit detects whether a quantity of consumable supplies in the customer equipment is less than a given reference quantity. A consumable-supplies purchase order from the customer equipment is transmitted to the purchase-order processing apparatus when the quantity of the consumable supplies is less than the reference quantity. An order-reception message, sent by the purchase-order processing apparatus, is received when the purchase order is received at the purchase-order processing apparatus. An indication of completion of the purchase order is displayed on an operation panel after the order-reception message is received.

Abstract: A process for treating water vapor generated in concentrating an aqueous urea solution wherein a urea synthesis effluent containing urea, unreacted ammonium carbamate and water from a urea synthesis zone is subjected to a plurality of decomposition stages, the pressures of which stages are stepwise reduced to decompose and separate substantially all of the unreacted ammonium carbamate from the aqueous urea solution. The aqueous urea solution which still contains small amounts of ammonia and carbon dioxide is concentrated to obtain crystalline urea or molten urea substantially free of water. The water vapor generated in concentrating said aqueous urea solution which contains small amounts of ammonia and carbon dioxide is cooled for condensation thereby forming a dilute aqueous ammonium carbamate solution which is subjected to rectification under a gauge pressure below 25 kg/cm.sup.