Detail Segment/Index File information screen during lookup
After pressing <F9> for a lookup for either Detail Segments or Index Files, press the number of the Segment/File you are interested and then press the right <Ctrl> key. An information screen will appear with the basic information about the Segment/File you have chosen. A brief list of the fields available within that Segment/File will be displayed.
This comes in handy especially for selecting Index Files. The subscripts involved in the File will be displayed. Sometimes there is also documentation from Meditech about the Detail Segment/Index File.