open or close the preview of a project page or macro
| Parameter | Description |
|---|---|
| PROJECTNAME | name of the project; if the path is missing, the default value is used (see $(MD_PROJECTS)) |
| PAGENAME | name of page as string |
| MACRONAME | complete path to a window or page macro (with extension); if the path is missing, the default value is used (see $(MD_MACROS)) |
| SHOW | 1: the preview of the page/macro will be opened; 0: the preview will be closed |
if PAGENAME and MACRONAME are empty, all pages of the project will be displayed in the preview