title: Make Shinyapp use new input across sessions
body: <p>I´m using a shinyapp on an opensource shiny-server to display a dashboard on multiple devices. I want to give the opportunity to change the plots on all dashboards from a local PC.
  If the input is altered in any session, all sessions should update their plots to this new input. How do i do this? Can i save the input in a global variable? </p>
  
  <pre><code>library(shiny)
  
  # Define UI for application that draws a histogram
  ui &lt;- fluidPage(
  
     # Application title
     titlePanel("Old Faithful Geyser Data"),
  
     # Sidebar with a slider input for number of bins 
     sidebarLayout(
        sidebarPanel(
           sliderInput("bins",
                       "Number of bins:",
                       min = 1,
                       max = 50,
                       value = 30)
        ),
  
        # Show a plot of the generated distribution
        mainPanel(
           plotOutput("distPlot")
        )
     )
  )
  
  # Define server logic required to draw a histogram
  server &lt;- function(input, output) {
  
  
    observe({
      invalidateLater(10000)
        # generate bins based on input$bins from ui.R
        x    &lt;- faithful[, 2] 
        bins &lt;- seq(min(x), max(x), length.out = input$bins + 1)
  
        # draw the histogram with the specified number of bins
       p&lt;&lt;- hist(x, breaks = bins, col = 'darkgray', border = 'white')
    })
  
  output$distPlot &lt;- renderPlot({print(p)})
  }
  
  # Run the application 
  shinyApp(ui = ui, server = server)
  </code></pre>