This will tell the program to accept a file as the source of data stream. The file must be in the NSCL format, and either a BUFREAD subroutine to read this file format be linked into SMAUG or the correct format decoding file be read in via a FORMLOAD command so the generalized BUFREAD subroutine can read it.

‘What file to input? asks for the name of the file it is to read as the data stream input.