The VMware View Agent Configuration ADMX template file (vdm_agent.admx) contains policy settings related to Session Collaboration.

These settings are in the Group Policy Management Editor in the Computer Configuration > Administrative Templates > VMware View Agent Configuration > Collaboration folder.

Table 1. Session Collaboration Policy Settings
Setting Description
Allow control passing to collaborators When enabled, users can pass input control to other collaborators during collaboration. When disabled, the toggle switch does not appear in the collaboration window. This setting is enabled by default.
Allow inviting collaborators by e-mail When enabled, you can send collaboration invitations by using an installed email application. When disabled, you cannot use email to invite collaborators, even if an email application is installed. This setting is enabled by default.
Allow inviting collaborators by IM When enabled, you can send collaboration invitations by using an installed Instant Message (IM) application. When disabled, you cannot use IM to invite collaborators, even if an IM application is installed. This setting is enabled by default.
Separator used for multiple e-mail addresses in mailto: links Configures the separator used for multiple e-mail addresses in mailto: links to allow better compatibility with various email clients. When not configured, the default value is a semicolon without a space to separate email addresses.

If your default email client does not allow a semicolon as a separator, try other combinations, such as a comma plus one space or semicolon plus one space.

Server URLs to include in invitation message Sets the server URLs to include in collaboration invitations. If left unconfigured, a default URL will be used, but this may be incorrect in all but the simplest deployments.
Turn off collaboration When enabled, the Session Collaboration feature is turned off entirely. When disabled or not configured, you can control the feature at the farm or desktop pool level. This setting takes effect after you reboot the Horizon Agent machines.
Maximum number of invited collaborators Specifies the maximum number of collaborators that you can invite to join a session. The default maximum is 5. The limit is 10.