Problems with adding printers

[Margaret Doll]

With the latest updates on RedHat EL 2.6.9-55.0.2,  I have been  
having problems adding network printers to the system.

printtool, setup and the web interface do not seem to be working well  
with each other.

printtool  a member of system-config-printer-gui-0.6.116.10-1
cups is version 1.1.22-0.rc1.9.20.2
setup is 2.5.37-1.3

printtool no longer modifies /etc/printcap.  When I add printers in  
printtool, apply, exit, restart cups and then "export  
PRINTER=newprinter", "lpq" gives me an error of
lp:  error  --  PRINTER environmental variable names non-existent  
destination.

If I enter a printer via setup using the ip address of the printer  
and port 9100, lpr and the web interface cannot find the printer.   
lpq shows the printer as not ready.  I have to go into the web  
interface, modify the printer's location with its full network name.

What interface should I be using to add printers?  I was previously  
using printtool exclusively.