Hi,
Are you looking for
1.A link from maximo which will open the specified URL in a new web page
(or)
2.A way to display the URL content itself with in one of the maximo tabs(may be a new custom tab).For example, custom tab called IBM Site in workorder application and when you click on the tab ,it would show the web page contents with in this tab)
Option 1 can easily be achieved through the application designer.and for option 2 we need to go for 'iframe' custom tags.
Thanks.