Start a popup section.
| Type & position: | command, main part | 
| Syntax: | !psubsubnode <text> | 
| Description: | The same as !subnode but the contents will be displayed as a popup inside ST-Guide and WinHelp. | 
| Example: | !psubnode A popup subsection | 
| See also: | !pnode, !psubsubnode, !psubsubsubnode, !begin_pnode, Structure |