@chapter Combining Data Files
This chapter describes commands that allow data from system files,
-portable files, scratch files, and the active dataset to be combined to
+portable files, and open datasets to be combined to
form a new active dataset. These commands can combine data files in the
following ways:
files are not changed on disk.
The syntax of each command begins with a specification of the files to
-be read as input. For each input file, specify FILE with a system,
-portable, or scratch file's name as a string or a file handle
-(@pxref{File Handles}), or specify an asterisk (@samp{*}) to use the
-active dataset as input. Use of portable or scratch files on FILE is a
+be read as input. For each input file, specify FILE with a system
+file or portable file's name as a string, a dataset (@pxref{Datasets})
+or file handle name, (@pxref{File Handles}), or an asterisk (@samp{*})
+to use the active dataset as input. Use of portable files on FILE is a
PSPP extension.
At least two FILE subcommands must be specified. If the active dataset