+\n "Create boundary elements" dialog allows creation of boundary elements
+of three types.
+<ul>
+<li><b>2D from 3D</b> creates mesh faces on free facets of volume elements</li>
+<li><b>1D from 2D</b> creates mesh edges on free edges of mesh faces</li>
+<li><b>1D from 3D</b> creates mesh edges on all borders of free facets of volume elements</li>
+</ul>
+Here a <em>free facet</em> means a facet shared by only one volume, a <em>free edge</em>
+means an edge shared by only one mesh face.
+
+In this dialog:
+<ul>
+<li>specify the <b>Mesh, submesh or group</b>, the boundary which of
+will be analyzed.</li>
+<li>specify the <b>Target</b> mesh, where the boundary elements will
+ be created.
+ <ul>
+ <li><b>This mesh</b> adds elements in the selected mesh or the mesh
+ the selected submesh or group belongs to.</li>
+ <li><b>New mesh</b> adds elements to a new mesh. The new mesh appears
+ in the Object Browser with the name that you can change in the adjacent box. </li>
+ </ul></li>
+<li>activate <b>Copy source mesh</b> checkbox to copy 2D or 3D
+ elements (depending on the operation type), which belong to the analyzed
+<b>Mesh, submesh or group</b> field, to the new mesh.</li>
+<li>deactivate <b>Copy missing elements only</b> checkbox to copy
+ boundary elements already present in the analyzed mesh to the
+ new mesh.</li>
+<li>activate <b>Create group</b> checkbox to create a group to which the
+ missing boundary elements are added. The new group appears
+ in the Object Browser with the name that you can change in the adjacent box. </li>
+</ul>
+<br><b>See Also</b> a sample TUI Script of a \ref tui_make_2dmesh_from_3d "Create boundary elements" operation.
+