The intention of this procedure is to maintain full pressure control during drilling operations and have the bit as close as possible to bottom in case a kick should occur. At the same time have the kelly valve close to the rotary table in order to carry out jobs which require a tool joint near the rotary table, e.g. installation of high pressure circulation lines, wireline lubricator, etc.
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Co-op Mailing means that two or more businesses share in the cost and distribution of a direct mail campaign. It's kind of like having you and another non-competing business split the cost of printing, assembling and mailing an advertising flyer to a shared same market base.