server2003 XPclient cant display user or groups of domain?

hi

i have a PC as domaincontroller all is working

DHCP DNS all OK

in explorer/My network places/Microsoft Windows Network i can see my domain and all PCs connected to the domain and some shared folders

this works on server and client without problems

now i like to share a folder on the XP domain client PC

and i like to share it to a user of the whole domain or a user of the DomainControllerPC2003

i rightClick the folder and then i go to properties

i click share and add some users

but here i only can see local users .. no domain users and no server2003 users

is i choose location it only display my local XP-domain-client there is no Server2003-domain-controller or similar

what i have to do to see all domain users on a domain client

is there something in gpo?

please i need any tip

do i have to create all domain users on each PC?

if i try to add with DOMAIN\Server2003\user1 or \\Server2003\user1 or similar it say

The object named "Domain\User" is not from a domain

please help