PROVIDING ON-LINE RETAIL STORE SERVICES; COOPERATIVE ADVERTISING AND MARKETING OF EDUCATIONAL GOODS AND SERVICES OF OTHERS VIA THE GLOBAL COMPUTER NETWORK; PROMOTING THE EDUCATIONAL GOODS AND SERVICES OF OTHERS BY RESPONDING TO INQUIRIES OF POTENTIAL PURCHASERS OF GOODS AND SERVICES WITH ADVICE CONCERNING APPROPRIATE EDUCATIONAL GOODS AND SERVICES, AND EFFECTING THE PURCHASE OF SUCH GOODS AND SERVICES ON BEHALF OF THE CUSTOMER