Put in a widget, post or page... From the master site to all slave sites

Put in a widget, post or page...
From the master site to all slave sites.

A while back I think I read something about how a widget (page, post) could be put into a sidebar from the main site.

Meaning... The master site is set up the same as the slaves.
(My terminology may be wrong here - I mean no offense).

So if on the main site I add a text widget to a left sub-sidebar -
(used as example).

I want it to be the 3rd in the order of 5 widgets in said side bar.

I want that to be in all 150 slaves.
executed from the top in one easy "move"....

My question is...
Was I dreaming or is this possible?

Thank you