can i use dell display manager to control my dell u2722d when it's hooked up to two different computers for kvm?

Yes, you can. DDM is designed to communicate with your monitor even when it's displaying video from a different computer connected via KVM or multiple inputs.

Here's how to set it up:

1. Install the Dell Display Manager software on the computer you use most often for control. You can also install it on the other computers connected to the monitor.
2. In DDM, go to the Input Manager tab. Click on the KVM section.
3. Enter the number of PCs you want to connect (PC1, PC2, PC3). For each one, you'll select the specific Video Input Port (like HDMI 1, DisplayPort) and the USB Upstream Port it's connected to.
4. Once configured, you can use DDM to switch inputs and control settings from your primary computer, regardless of which PC's video is currently active on the screen.