INFLD does a lot of the heavy lifting when converting from text to GUI, much of it without any program changes at all. But this only helps if you actually use INFLD for data entry. The more consistent and systematic use you make of INFLD, the easier the conversion will be. In particular, using INFLD for displaying data as well as just inputting is a big help. Also, the more you have centralized your calls to INFLD and standardized your TYPE codes, the better off you will be. This applies just as well to the text environment as to the GUI environment, and is a good example of how the effort to convert to a GUI might actually improve the text version of your application.
Note that not all is lost if you use some other input routine, if you do so consistently, because INFLD is able to act as a wrapper for most other input routines. But the reverse is most definitely not true in the GUI world, so you will want to look at converting to INFLD first.
