How to share only one desktop on a projector/screen..? Do we need to program.?

No need to do any special program. We can connect the Desktop to the projector by using different ways (VGA,HDMI..). Most commonly VGA cable will use to connect. The first step is , Connect the VGA cable into the VGA port of the projector and the other end to the Desktop. Then plug the projector power cord into the electrical outlet , After that just turn on the PC and the Projector. If you don't see anything on the screen you may need to change the screen resolution and select the appropriate output device.

When you project the screen to the projector/second screen you need to extend instead of duplicate... In window environment, when you go to projection option (win key+p) select extended screen now you can drag and drop whatever you want in this projected screen.. Linux is also similar case

No Need to have a special program, Pres P while holding Windows key (Windows Key + P) then select Extended Screen and Guide area into the screen (Drag and drop) you want to see on projecter

1. Open the Control Panel2. Double-click Display icon.3. In the Display properties window click the Settings tab.4. In Settings tab under the Display click the down arrow and select the secondary display connected to your computer.5. Once selected check the Extend my Windows Desktop onto this monitor option.

No need to program because you can use other accessories like HDMI or VGA to project the screen.

you must install vga card on your cpu in order to do so

if the os we are using windows 10 we dont need any programe it does have its on defult driver may be just nmay be on some windows product we might need new driver to read the projecter but mostly we dont need anything

we need instal specific drivers

No not required any special software just press Windows Key + P   then select Extended Screen and  just Drag and drop.

 

Programming is not required. Extending the desktop display in Projector can be done under Windows Display settings or thru Short function keys in keyboard. Just connect the VGA or HDMI or depending on the available display connector, to Projector.

You have to connect the computer to the projector using physical connections like:

 

VGA, HDMI, Composite video... etc.

 

Also, you can use screen mirroring if the projector/screen support this option by network connection (wired and wireless connection)