Does a monitor need to be plugged into mobo to use onboard graphics?

Does a monitor need to be plugged into mobo to use onboard graphics? I was told it was possible to have my browser use my onboard graphics (Intel HD 530) whilst my video-editing program uses my graphics card.

OS: Win 10 Pro 64-bitMainboard: ASUS Z170 Pro Gaming, board revision 1.04, BIOS v1904CPU: Intel i7 6700, Stock HSF, Undervolt Offset -0.15 V, LLC 4RAM: Corsair LPX Vengeance 2x8GB DDR4-3000 (CMK16GX4M2B3000C15)Graphics: Gigabyte NVIDIA GeForce GTX 950 w/ 2 GB

To use the onboard graphics, the monitor must be plugged into the video jack on the motherboard.

But whether you can use both onboard and a video card depends on the particular motherboard. All that I have used require using one or the other, but not both. But I have heard of folks being able to use both with other motherboards.

Mark Phelps said:

To use the onboard graphics, the monitor must be plugged into the video jack on the motherboard.
But whether you can use both onboard and a video card depends on the particular motherboard. All that I have used require using one or the other, but not both. But I have heard of folks being able to use both with other motherboards.

Well I was able to enable the onboard graphics in the UEFI and after installing the Intel HD 530 driver the onboard graphics appeared alongside the graphics card in the Device Manager Display Adapters. My monitor is still plugged into the graphics card however. I have a second monitor I got free because it was meant to be broken but apparently isn't so I'll try plugging that in.