DFF provides a common interface to integrate different
force fields into TEAM-FF. A force field has three components: force field type
(e.g. TEAM, AMBER, CHARMM, CFF, or DREIDING), definition of atom types and list of force field
parameters. An external force field can be imported to TEAM-FF as long as its force
field type is supported by DFF. The atom types are of central importance as they
are used to identify parameters. Novel techniques implemented in DFF provide definition
of atom types and enable integration of external force fields in a user-friendly
way
The following screenshot shows that three force
fields in AMBER format are used together, two of them are external force
fields.