AFAIK Standard edition does NOT allow multi-instance. You will only see that in the free Developer or pricey Enterprise edition.
To run multiple CF App under the same instance, you can do multiple Application.cfc (logical application) and map them in your web server respectively by webroot. They will be sharing the same CF instance, but at least your Session / Application scope won't be mixed up if you give each Application.cfc a different this.name
.