Suppose we create a template T with application A, item I, trigger R, and graph G. We then link template T to host H. Application A, item I, trigger R, and graph G are shown on the host H now (coming from a template).

Now, if we delete the template through the template editing form by pressing "Delete", template T is deleted, but application A, item I, trigger R, and graph G are still shown on the host H (without a template now).

However, if we delete the template by choosing "Delete selected" from the template list, template T is deleted, but so are application A, item I, trigger R, and graph G. They no longer appear on host H.

PS: Open a template. Pressing "Delete" shows a popup with "Delete selected host?". Pressing "Delete AND clear" show a popup with "Delete selected hosts?". Deleting a template gives message "Host deleted". Also, why "AND" is capitalized on that button?