@ MozzerFan
I tried editing the CD0 file itself, I was allowed to open it, but after editing I was not allowed to save the file.
I also noticed that the file claimed that these things (DEVICE, UNIT and ACTIVATE) would be handled by the icon tooltype.
Btw, if I double click on the CD0 icon I don't get the "Unit already mounted" explanation... could this be because I have not installed the CSPPC SCSI disk ??
EDIT: If the CD-ROM drive is unit 2 (in 0 to 15) in the CSPPC boot menu it should also be unit 2 in tooltypes in WB, right ??