Negotiation and conclusion of commercial transactions for third parties; Negotiation and conclusion of commercial transactions for third parties via telecommunication systems; Negotiation and renegotiation for others of leases and subleases and real estate purchase agreements; Negotiation and settlement of commercial transactions for third parties; Negotiation of business contracts for others; Negotiation of commercial transactions for third parties; Administering discount group purchasing programs for the wine industry by negotiating contracts with providers of products and services to wineries enabling discounts for participant members; Administering discount medical, cosmetic and aesthetic service programs, namely, negotiating contracts with providers of medical, cosmetic and aesthetic services, to enable participant members to obtain discounts on the purchase of medical, cosmetic and aesthetic products and services through the use of discount membership cards; Assisting with the formation, negotiation, and management of contracts with public sector entities; On-line trading services in which users post requests for products and negotiate transactions via the Internet