
Setting Stateful or Stateless
You can classify a BSP application in two types – stateful or stateless:

You can define a BSP application as stateful by selecting the BSP application characteristic Stateful. If the checkbox is deactivated, the BSP application is working in stateless mode.
At any given time, a BSP application can be switched from stateless to stateful (and vice versa). This would make sense, for example, if you wanted to retain the roll area for a few consecutive pages but not for the whole application. You can set this by setting or deleting the attribute
See also:
Stateful or Stateless Programming?