Through a collaborative effort between Ameritrade and Net.B@nk, Ameritrade's one million-plus brokerage customers will be able to access Net.B@nk's online-banking services. Ameritrade will offer brokerage services to Net.B@nk's customers via Amerivest, the broker's subsidiary. Customers of both companies who access each contributors' services will be allotted specific bonuses. With customer permission, Ameritrade and Net.B@nk will share customer information.