1. A method for processing information in a computing system including a capacitive touch sensing input surface, the method comprising: obtaining information of each contact of a plurality of contacts, wherein the contacts correspond to touch objects on or near the surface; associating each contact with a different bit positions in a bitfield, wherein the associating includes encoding the information of each contact in the bit position associated with the contact; determining a motion of a first contact of the plurality of contacts from a first position on the surface to a second position on the surface; maintaining the association of each contact with the same bit position previously associated with the contact during the motion of the first contact from the first position on the surface to the second position on the surface, in maintaining the association each contact is associated with only a single bit position in the bitfield; and applying a bitmask to the bitfield to determine the information of a set of one or more contacts of the plurality of contacts.