. You are here: Foswiki > System Web > Macros (revision 1) E dit A ttach . Special text strings expand on the fly to display user data or system info . Macros are text strings in one of two forms: %MACRONAME% %MACRONAME{ parameter="value" }% . These usually expand into content when a topic is rendered for viewing. There are two types of macros: . Preference settings : May be defined and modified by the user . Registered macros: Defined by the system or by Plugins (for example, the SpreadSheetPlugin