MTS transparently returns the contents of NAMEA followed by the contents of NAMEB or writes to NAMEB after writing to NAMEA reaches an end of file or other error condition. Implicit concatenation occurs when an input line contains the string: $CONTINUE WITH FDname MTS will continue with the FDname given as the new source of data. Or, if a line of the form: $CONTINUE WITH FDname RETURN is read, MTS will return the contents of the new FDname until and End-of-File is reached and then return the next line of the original FDname (note that, a file that continues with itself causes an infinite loop, usually a mistake, but sometimes used to good effect). While the line starts with a dollar-sign, $CONTINUE WITH is not an MTS command, but rather a delimiter. The @IC I/O modifier and the command $SET IC={ON | OFF} can be used to control implicit concatenation. $ENDFILE lines If a line contains the string $ENDFILE, MTS returns a 'soft' end of file. While the line starts with a dollar-sign, $ENDFILE is not an MTS command, but rather a delimiter. The @ENDFILE I/O modifier and the command $SET ENDFILE={ALWAYS | SOURCE | NEVER} can be used to control $ENDFILE processing. $9700 and $9700CONTROL lines Lines that begin with the strings "$9700" or "$9700CONTROL" may be copied or written to *PRINT* to control print options on the Xerox 9700 page printer. $9700 lines take effect at the point where they occur, while $9700CONTROL lines apply to the entire print job in which they occur. While these lines have a form similar to MTS commands, they are really device commands and not true MTS commands. Files MTS files are stored as 4096 byte "pages" on one or more public or private disk volumes. Volumes have volume labels, volume numbers, and volume names (usually MTS001, MTS002, ..., MTSnnn). Disk volumes are stored on traditional cylinder-track-record and fixed block architecture (FBA) disk drives or at one time on the IBM 2321 Data Cell. Individual files do not span disk volumes. The maximum size of a file is limited to the free space available on the disk volume where it resides. By default, files are created one page in size, but a larger size as well as a maximum size may be specified ($CREATE name SIZE=nP MAXSIZE=nP). Files will automatically expand until they reach their maximum size or the disk space limit