Before you use a variable in a PocketBuilder script, you must declare it (give it a datatype and a name).
A variable can be a standard datatype, a structure, or an object. Object datatypes can be system objects as displayed in the Browser or they can be objects you have defined by deriving them from those system object types. For most variables, you can assign it a value when you declare it. You can always assign it a value within a script.
