1. An interface structure comprising: a graphical user interface operatively connected to a legacy system, said graphical user interface performing the following: receiving, from a user, inputs for accessing a data field through an interface application of said legacy system; displaying, as said inputs are received, screens until a screen containing said data field is displayed, said screens being generated by said interface application based on said inputs; and, when said screen with said data field is displayed, receiving, from said user, a tag labeling said data field; a sequence tracing device operatively connected to said graphical user interface and automatically tracing the sequence of events resulting in display of said screen with said data field; a data storage device operatively connected to said sequence tracing device and storing said sequence with said tag; and a sequence applying device operatively connected to said data storage device and to said graphical user interface, said sequence applying device automatically accessing said data storage device to retrieve said sequence in response to a request referencing said tag and further automatically applying said sequence.