Often company network policies will separate network traffic. A network may be segmented to separate between Internal network and Guest network. Internal users have no restrictions, while Guest users are only allowed internet and no further network access. Usually traffic on these two network layers is separated in two different VLAN's, but firewall exceptions can be setup to allow traffic from the Guest VLAN to reach certain IP addresses in the Internal VLAN. Once exceptions are made in the firewall that allow the ports that wePresent requires to the communicate, then Guests will be able to present from the Guest VLAN to the wePresent in the Internal VLAN.
For a Guest to present to one specific target wePresent in a different VLAN, they will need to use one of the methods for direct-IP-approach. For more information, please check the options for Guest users.