pkg://urpmi-4.0-20.1mdk.src.rpm:630489/HEADER  downloads

Name        : urpmi                        Relocations: (not relocateable)
Version     : 4.0                               Vendor: MandrakeSoft
Release     : 20.1mdk                       Build Date: Tue Dec 17 08:16:40 2002
Install date: (not installed)               Build Host: updates.mandrakesoft.com
Group       : System/Configuration/Packaging   Source RPM: (none)
Size        : 624241                           License: GPL
Packager    : Linux-Mandrake Security Team <security@linux-mandrake.com>
URL         : http://cvs.mandrakesoft.com/cgi-bin/cvsweb.cgi/soft/urpmi
Summary     : User mode rpm install
Description :
urpmi takes care of dependencies between rpms, using a pool (or pools) of rpms.

You can compare rpm vs. urpmi  with  insmod vs. modprobe