In a distributed setup you can use the contact groups from the slave, to see only certain things provided by this contact group on the master viewer site.
If you have a distributed setup, where you enable WATO and manage the contact groups central, you can ignore this how-to.
Step-by-step guide
Config on the slave
create a contact group on the slave
assign hosts and services to this contact group
assign the contact group to the user
Config on the master
If you now login to the master viewer site, you will ony see the hosts/services you're a member of
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