In order to give users client via web interface oppose to be re-directed to Citrix.com website, following needs to apply:

- check folder - C:\Program Files (x86)\Citrix\Web Interface\5.4.0\Clients\Windows\Receiver for clients

- go to - C:\inetpub\wwwroot\Citrix\DesktopWeb\conf

- open WebInterface.conf with Notepad

- edit line ClientICAWin32=Filename:CitrixOnlinePluginWeb.exe to either

   CitrixReceiver.exe OR CirixReceiverEnterprise.exe

Citrix eDocs - Configuring and Installing Receiver for Windows Using Command-Line Parameters

http://support.citrix.com/proddocs/topic/receiver-windows-32/ica-configure-command-line.html