To configure desktop sharing

1. Log on to the computer where the Communicator Web Access snap-in has been installed. You must log on as a member of the local Administrators group and a member of the RTCUniversalServerAdmins group.
   
   
2. Click Start, point to Administrative Tools, and then click Office Communications Server 2007 R2.
   
   
3. Right-click the forest node, click Propertiesand then click Global Properties.
   
   
4. In the Office Communications Server Global Propertiesdialog box, on the Meetingstab, select the desired setting from the Anonymous participantsdrop-down list.
   
   
5. In the Global Policydrop-down list select Default Policyand then click Edit.
   
   
6. In the Edit Policydialog box type a value in the Maximum meeting sizebox.
   
   
7. Click Enable web conferencing, click Enable program and desktop sharing, and then select the Allow control of shared programs and desktopcheck box to allow users to take control of a shared desktop session.
   
   
8. Make any other configuration changes as needed and then click OK.
   
   
9. In the Office Communications Server Global Propertiesdialog box, click OK.