I knew someone would say "they have been replaced with userforms" <g>. I always use them
when looks matter.
Workbooks with a dialogsheet would display it as a sheet with a sheet tab. If not then
it's hidden. You can insert a dialog sheet by rightclicking a sheet tab and choose
"insert" > "Excel 5 Dialog".
Dialogsheets have no VBA events and neither does their controls. So they are far worse and
quite limited for programming purposes. But on the good side; their controls are parts of
collections ("Loop all checkboxes" tasks), and they are superior to most Offfice things
when it comes to graphics.