FMGS programming involves inserting navigation data, then performance data.

Boxed fields must be filled

Blue fields inform the crew that entry is permitted

Green fields are used for FMS generated data, and cannot be changed

Magenta characters identify limits (altitude, speed or time) that FMS will attempt to meet

Yellow characters indicate a temporary flight plan display

Amber characters signify that the item being displayed is important and requires immediate action

Small font signifies that data is FMS computed

Large font signifies manually entered data