let’s check how to use display content at a second screen to raise productivity, there are several options to enlarge your screen, the power of your mobile device is most of the time enough to serve multi screen
windows

project, duplicate, extend are availabe options when hit windows key + p to open up charms bar with available options to display wired connected to hdmi or wireless adapter via miracast
macos
to add an unwired further screen like an ipad, andro
id, windows or even another mac – use airdisplay or interesting as a hardware solution lunadisplay
since macos catalina the sidecar extend screen natively with iPad

huawei

got it’s own desktop mode when connected via hmdi to a tv, attach keyboard, show presentation direct from your mobile or mirror your mobile screen wireless to miracast or chromecast
windows phone

continuum is/was a clever system, but HP Elite X3 was the latest device to support it, microsoft finally quite the phone project
read more about ..

samsung

offers wir dex a hadware adapter to connect you samsung mobile to your monitor, keyboard, etc. – looks like combinded version of huawei and continuun, intersting to access from mobile device via dex dock to virtual desktop
blackberry
blend seamlessly brings messaging and content that’s on your blackberry smartphone to your desktop and tablet
anycast
if the is no build in solution, this is problalby the best way that support airplay, miracast, dlna up and up to 4k in a single device
dualscreen
this trend driven further since microsoft shortly announced the android powered surface duo and surface neo both with a buildin second screen – samsung already released a dualscreen device with it’s fold, huawei will maybe following