What should I do to say PV that rc.M has to be changed if we want to use HP printer-scanner-copier with Slackware?
The hpoj driver that we need to make HP multifunction work in Slackware has to be loaded before the printer spooling system.
So /etc/rc.d/rc.M suold look like this
# Initialize HP Officejet support:
if [ -x /etc/rc.d/rc.hpoj ]; then

# Start the print spooling system.  This will usually be LPRng (lpd) or CUPS.
if [ -x /etc/rc.d/rc.cups ]; then
  # Start CUPS:
  /etc/rc.d/rc.cups start
elif [ -x /etc/rc.d/rc.lprng ]; then
  # Start LPRng (lpd):
  . /etc/rc.d/rc.lprng start
instead of the reverse, as it is now.