Working with Host built in in forms

Hi everybody,
I am working on form in which i created menu. That menu has submenu called 'Service desk. when user click on 'service desk' it take the user to weblink which is opened in mozilla firefox.. I used host built in to launch mozilla firefox. It works fine.
The next functionality i want that is when firefox is not installed on system then it will populate message to user "Please install firefox". How can i check with oracle forms whether firefox is installed in system or not. Is there any way to do it?
I am using solaris 9 and forms 6i.
Please help me on this.

Can you be more specific about your environment? You are using 6i and the host command, so I assume you are using 6i in client/server mode. Is that on Windows? What are you running on Solaris?
If the client runs on Windows, you can check the registry for the default browser with Win_Api_Environment.Read_Registry. You will have to Google a bit to find out which key is used to specify the default browser.
You can also check where Firefox is installed with registry path HKEY_LOCAL_MACHINE\SOFTWARE\Mozilla\Mozilla Firefox\3.5.5 (en-US)\Main and registry key PathToExe.
It should be something like this:
declare
v_firefox   varchar2(100);
begin
     v_firefox := Win_Api_Environment.Read_Registry
       ('HKEY_LOCAL_MACHINE\SOFTWARE\Mozilla\Mozilla Firefox\3.5.5 (en-US)\Main'
       ,'PathToExe'
       ,true);
message('Firefox is installed on: '||v_firefox);
exception
     when no_data_found then
       message('Firefox is not installed');
end;

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