About Detail Only forms
A detail-only form displays the details for a single record of an IDO collection. This form is basically the same as the Detail View on a multiview form. See About MultiView forms
The limitation and potential drawback of creating this type of form is exactly that you can only view a single record from the collection at a time. Because there is no accompanying Grid View, the only way to navigate through the records in the collection is either with the navigation buttons on the main toolbar or by setting components on the form itself to provide the navigation options.
One major advantage to using this type of form is that it can be used more easily by users with little or no WinStuido experience, especially in a web client situation.
Other than the absence of the Grid View, this type of form is similar to the multiview form and has virtually all the same capabilities, including the potential to host container components and subcollections.