on the asumption these are network capable printers you
would need a wireless NIC. if they are not net printers
then you would need to use something like hp jet direct
with a print server.
If the printer is on the network and you know the IP you
could just add it as a local printer(dont autodetect),
then creat a new port(standard TCP\IP). This will bring
up the add port wizard. Enter your printers IP on the
first line and hit next. you should be able to finish
from there.... Hope I helped.