In Strategy Web 9.4.1, it is possible to create a new prompt by clicking the option shown below:

When clicking that option, the Create Prompt page will be displayed:

With Strategy Web 9.4.1, users can use URL API to open this page. A sample URL is shown below:
http://WEBSERVERNAME:8080/MicroStrategy/servlet/mstrWeb?evt=3123&src=mstrWeb.3123&Project=PROJECTNAME&Server=SERVERNAME&uid=USERNAME&pwd=PASSWORD