Clients can be opened with the Direct Launch Links in addition to using the Gateway Home page. These links can be used in any browser on the network and will launch the .jnlp files without a desktop shortcut.

To open a Client with the Direct Launch Link

Go to the Configure section of the Gateway.
Go the the Configuration > Projects page. You will see a list of your projects on the Projects page.
Click the view link to the far right of the row for the project you want. You will see the Project details for 'your_project_name', and the Published and Staging launch links.
Right-click on Published/Windowed and choose Copy link address.
Go to your web browser, paste the link, and press enter to launch the Client.