Program / Preview (PGM / PVW)

What is it?

Program and Preview are the two monitors at the heart of every broadcast control room:

• Program (PGM) — what is on air right now; what the audience sees.
• Preview (PVW) — what is lined up next: the shot being composed, checked, and made ready before it goes live.

The discipline they enforce: nothing reaches the audience without being seen and approved on Preview first.

Practical example

The director wants to bring up a graphic with the guest's name. The operator loads it on Preview: the director glances — name spelled right, layout clean — "take it," and the graphic moves to Program. Now the next camera shot is built on Preview while the current one airs: the camera operator reframes, focus is checked, and only when it's ready does it take to Program. The audience never sees a camera hunting for focus or a graphic with a typo, because everything they see already passed through the rehearsal monitor. The alternative — switching sources blind, straight to air — is how wrong graphics and unflattering shots end up broadcast.

Key things to know (non-technical)

• It's the broadcast version of a universal safety pattern: stage, check, commit — Preview is the staging area, Take is the commit.
• The classic operation pair: cut (instant swap of Preview→Program) or auto/transition (Preview arrives via fade or stinger).
• Preview is also where tally's second color lives: the source on PVW gets the "you're next" light.
• Solo live tools often skip Preview for simplicity — and the cost is precisely those on-air fumbles a staging step would have caught.

In Tupic Live

A Preview pane in Tupic Live's studio — tap a scene to stage it, see exactly what it will look like, then Take it to air — is the single feature that most separates "switching app" from "control room": it lets creators check the next moment before the audience lives it.