About Powerbuilder

PowerBuilder is an object-centric graphical application development environment. Using PowerBuilder, you can easily develop many types of applications and components. PowerBuilder provides all the tools you need to build enterprise systems, such as order entry, accounting, and manufacturing systems.

Two-tier and multitier 
PowerBuilder applications can be traditional graphical client/server two-tier applications applications that access server databases. A traditional client/server application is a collection of windows that contain controls that users can interact with. You can use standard controls—such as buttons, check boxes, drop-down lists, and edit controls—as well as special PowerBuilder controls that make your applications easy to develop and easy to use.

You can also build multitier applications with PowerBuilder. A multitier application usually has a client application that requests services from a server application or component. For example, your client application could request services from a PowerBuilder component on an EAServer or MTS server. The
server component often requests services from a server database and/or other server components.

Web applications
PowerBuilder applications can also be Web based. You can create a new Web-based application for the Internet or Intranet, or adapt or extend an existing PowerBuilder application for the Web.

Another resource for powerbuilder, you can read in Wikipedia . In there you can know if Powerscript is Script in Powerbuilder and also related link about Powerbuilder. So you can learn by your self.

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