All modern (hell even ancient PC monitors) are progressive scan, and refresh the entire picture at once. As long as your monitor can display a 720P or 1080i/1080P picture... ie 1280x720 or 1920x1080 then you can display HDTV resolutions in all their glory.
Most monitors can do 1280x720, but most can't do 1920x1080. Also remember LCD screens are limited to one max resolution, but CRT's have alot of leeway when choosing a resolution.