Public app CONTEXT(“Device”)

[Shodushi]

Hello there,
In public app to prevent multiple filling the form

1. What is the best way to use CONTEXT(“Device”) ?
2. Can I also add UNIQUEID() ?

( CONTEXT("Host") = "Browser" )
( CONTEXT("Host") = "Device" )

or

ifs(
context(“Host”)=“Device”,“Please use browser instead !”,
context(“Host”)=“Browser”,“Please use device instead !”
)

or

ifs(
context(“Host”)=“Device”,“Tap Below To:”,
context(“Host”)=“Browser”,“Click Below To:”)

Should I use it to Show if ? ? It would be great if button in the menu will be hidden after filled form.

Or to INITIAL VALUE in the form/where exactly ?