EXIST [{ALL:ANY}] <FILELIST>

     This condition checks if there are any <FILELIST> files on the drive.
In case all or any (depending on non-obligatory parameter {ALL:ANY}) such
files are found on the drive (even if they are empty), the condition is
considered true.

     If non-obligatory parameter specifies ANY (this is assumed by default)
and if the Shell comes across at least one of them then the condition is
considered true.

     If parameter ALL is specified the condition is true if all the files
from <FILELIST> are found on the disk.  The default value of this parameter
is ANY.

     For more information about <FILELIST> use see
                                    "INTERNAL DOS COMMAND ARGUMENTS"