$! in case a privious submitted batchjob didn't end properly:
$ FILE = F$SEARCH("SYS$SCRATCH:ACCEL.MESSAGE")
$ IF FILE .NES. """" THEN DELETE SYS$SCRATCH:ACCEL.MESSAGE.* /NOCON
$! run accel$EXEdirectory:ACCEL
$ ACCEL
$! in case ACCEL didn't end properly:
$ FILE = F$SEARCH("SYS$SCRATCH:ACCEL.MESSAGE")
$ IF FILE .NES. """" THEN DELETE SYS$SCRATCH:ACCEL.MESSAGE.* /NOCON