My apologies if this is in the wrong forum.
I have a Real Presence 500 with a PC plugged into the VGA Video Input and a Barco Clickshare in the HDMI Video Input.
Both work independently, however when trying to 'flick' between the inputs if the HDMI is active, then the VGA won't show.
Is it possible to have a 3rd content source so I can change between the HDMI and VGA (or show both at once).
Welcome to the forum and you are in the right place.
The GS 500 has 2 video inputs, one is the HDCI, High Definition Camera Interface, the other is the input that can be either HDMI or VGA and only one of them can be active at one time. Also the digital input (HDMI) takes precedence over the analog input (VGA). To get to the analog input the digital input has to not have a device connected to it that has power.
Using the API and a control device you can change the preference from digital to analog and back, that would be another solution. For information on the API see the Integrator's Reference Guide on the support web site.
Without some type of external mixing equipment you can not show the two content inputs at the same time.
The GS 700 has additional video inputs on it that would allow your user to select between different content inputs. You can also define the inputs as people or content so if your application involves the need to see 2 different inputs at one time you can use that and define one of your content inputs as people and send both content inputs at the same time. It would of course replace the people content (generally the camera). Since the GS 700 can support both people and content at 1080p/60 you would get really good quality no matter if it were People or Content.