In guard-file generation mode, the guard-file source is read from file SOURCE, which defaults to a file of KIND=PACK, FAMILYNAME=DISK. However, if no file equation is supplied for file SOURCE, the guard file source is read as file CARD (KIND=READER, TITLE=CARD, INTNAME=CARD). If no file equation is specified for either SOURCE or CARD, and the STATION attribute is nonzero, then the input is read from the terminal (SOURCE is set to KIND=REMOTE). Therefore, in the absence of any input file equation, the program reads a REMOTE file if the STATION attribute is nonzero or a READER file if the STATION attribute is zero.

Input File Equation Specifications summarizes the input file equation specifications for the guard-file source.