An enum that specifies how to open a URL.
The client can open a URL as either a full size window (if that is the frame used by the
client), or an overlay (such as a pop-up). The implementation depends on the client platform
capabilities, and the value selected may be ignored if the client does not support it.
FULL_SIZE is supported by all clients.
|Open in a full window or tab. Default.|
|Open as an overlay such as a pop-up.|