Disable one portlet from another?

1

Is it possible to disable for example the navigation portlet 'from my portlet'?

In other words: The navigation portlet shows on all content items (for example in a folder and subfolders', but if some content has enabled 'myportlet', it should not show.

2

In the same portlet manager or in any one?

3

In the same (that is the reason I only want one, it becomes too 'crowded')

UPDATE: I could disable ALL others if that makes a difference

4

Drop the other portlet with a Diazo rule