network printing problem: problem solved.

[XIAO Yan]

Thanks a lot for those who have offered help.
Here is the solution I adopted:

Just editing the local site interface script (/usr/spool/lp/interface/*)
	1. Change remote shell printing from "rsh lp at host lp "
	                                  to "rsh lp at host lp -c"
           (So printing machine put a copy into its own spooler)
        2. Add a line after printing like this: "rsh lp at host rm /usr/tmp/*"
And it works just fine.

NB.  When you read the interface script (/usr/spool/lp/interface/*), you
     will have a good idea of what to do.

Xiao