Providing on-line ordering services relating to heating, ventilating, air conditioning and refrigeration parts and equipment; providing on-line pricing quotes and electronic proposal forms relating to the sale of such equipment to end users; providing on-line training, marketing and sales materials relating to such equipment; providing on-line training and on-line access to information relating to factory training on such equipment; and, providing on-line warranty services relating to such equipment, all by the use of a global computer network