HP 3000 Manuals HP 3000 Manuals
Action Prefixes In addition to item and field referencing prefixes, HP ALLBASE/4GL also uses a set of prefixes to identify the action types that can be called from menus and function keys. The following table lists the action prefixes used in HP ALLBASE/4GL. Code Action Type B- Background process D- Data screen or menu F- Function logic block H- Help screen I- Internal action P- Process logic block R- Report X- External program Some of these action prefixes are identical to normal prefixes. For instance, the item referencing prefix P- indicates scratch-pad fields. The action prefix P- indicates a process. HP ALLBASE/4GL differentiates between the two types of prefix according to their usage. Normal item referencing prefixes have no meanings in the situations where action prefixes are used. When executing an X- action item, HP ALLBASE/4GL searches for the external program in the current group, and then in the groups specified by the MPE/iX system variable HPPATH.