There are condtion when you open Third party links with or without portal tempalet and passparameter to it. There are two function available in PeopleSoft.
Or
ViewContentURL("http://www. ThirdParty.com" | "? Param1=" | record.field.value);
ViewURL
ViewContentURL
This
function automatically launches a new browser window. The content specified by
the URL is not wrapped by the portal template. This function is best suits when
you want to connect to third-party
content.
Examples:
ViewContentURL(http://www.ThirdParty.com);
Or
ViewContentURL("http://www. ThirdParty.com" | "? Param1=" | record.field.value);
ViewURL
The content
specified by the URL is automatically wrapped by the portal template.