When installing Lync Server 2010 on a computer the corresponding computer account is made member of a number security groups. The table below shows the membership based on the server role

Role

Computer account member of the following groups

Front End

RTCHSUniversalServices, RTCComponentUniversalServices, RTCUniversalServerAdmins, RTCUniversalUserAdmins

Front End + Central Management Server

RTCHSUniversalServices, RTCComponentUniversalServices, RTCUniversalServerAdmins, RTCUniversalUserAdmins, RTCUniversalConfigReplicator

A/V Conferencing Server

RTCComponentUniversalServices

Director

RTCHSUniversalServices, RTCComponentUniversalServices, RTCUniversalServerAdmins, RTCUniversalUserAdmins

Survivable Branch Server

RTCHSUniversalServices, RTCComponentUniversalServices, RTCSBAUniversalServices

Mediation Server

RTCComponentUniversalServices

Monitoring Server

RTCHSUniversalServices, RTCComponentUniversalServices

Archiving Server

RTCHSUniversalServices, RTCComponentUniversalServices

Edge Server

None