The purpose of the ANDPARSE operator is to maintain hierarchical consistency. One PARSE operator may find a structure supporting a Participle, while on the other side of the ANDPARSE, a structure was found supporting a Present Participle. The ANDPARSE uses its access to the word structure to see that Participle and Present Participle are consistent, one being a child of the other.
The ANDPARSE operator keeps the non-grammatical altenatives in Pin 1, only the connections to Pin 2 and Pin 3 being pruned. These other alternatives are used later in the process. Also, if the associated PARSE operator is being healed from a cut, the ANDPARSE will put out a full range of alternatives. See Cutting and Healing.
ONLYCHILD and NOCHILD operators can suddenly sprout from the object connected to Pin 1 of the ANDPARSE as a result of a NOTCONSISTENT operator, and these will alter the parents of the object.
See the description of the PARSE operator and Finding Parents.