In virtually all cases, the decision is up to the adoptive parents regarding how to inform the child that he or she has been adopted, and at what age to do so, if at all. Although a non-profit adoption agency (if one is used) might mail newsletters and solicit funds from the parents, traditionally, it has been extremely rare for them to communicate directly with the child (usually, adoption agencies do not contain the word "adoption" in their name).
Many states, though, still keep this information sealed even after the adoptee and the birth parents agree to know and contact each other. A second court order would be required to have this information unsealed permanently. This is well beyond the scope of the initial search, and what is covered by the payment to the intermediary. Should an adoptee subsequently lose his or her unamended birth certificate, a court order may be required to obtain another one (even if a photocopy is submitted).
While a closed adoption does eliminate any risk of a rocky relationship, it also eliminates the possibility of a fulfilling, positive relationship. Moreover, birth mothers cannot reclaim their children under any circumstance, and adopted children are often less confused about their adoption when they know their birth mothers, who can answer their questions.
Usually, semi-open refers to an adoption in which the adopters and birthparents meet once or twice and on a first-name-only basis. In addition, they may agree to exchange pictures and letters on an annual or fairly infrequent basis through the adoption arranger. (If your adoption arranger advocates a semi-open adoption, be sure to ask for an exact definition of her terms.)
Most open adoptions lie somewhere in the middle, according to Grotevant and McRoy, exchanging letters, pictures, and phone calls, and having face-to-face meetings once or twice a year. Whatever their situation, many families report that relatives and friends condemn openness, and voice fears that the arrangement will make the birth parent want the child back.