Map Revealers? Are there any like in SC Editor?

I want to have the player see a certain part of the map, then fog it out again, I remember with starcraft, there were map revealers, so you could say

Condition: X
Action: Create X amount of map revealers at Location X

then when u dont want them to see it anymore

Condition: C
Action: Destroy all units (Map Revealers) at location X

is there anything like that? I know that locations are like regions, but cant find anything related to map revealers.

thx

-ZetsueiX

you can make a region be visible or not with triggers.

Make a Region visible for X time, then make it invisible.

Can you tell me how please?

-ZetsueiX

Use a natural unit to reveal, say a Night Elf Owl or a Orc Revealer, then kill it aftera certain amount of time. :)

'action-> visibility - hide/show region' or something

yep, figured it out hehe, thx! :D

-ZetsueiX