Add some print lines and a button to toggle terminal.

ui/rocket.ks

@@ -12,6 +12,17 @@ function nodeButtonPressed {
   run "execnode".
 }
 
+local termOn is false.
+function terminalButtonPressed {
+  if termOn {
+    CORE:PART:GETMODULE("kOSProcessor"):DOEVENT("Close Terminal").
+    set termOn to false.
+  } else {
+    CORE:PART:GETMODULE("kOSProcessor"):DOEVENT("Open Terminal").
+    set termOn to true.    
+  }
+}
+
 // Main UI.
 local interface is gui(200).
 set interface:X to 200.
@@ -44,6 +55,9 @@ set launchButton:onClick to launchButtonPressed@.
 local nodeButton is interface:AddButton("Execute Node").
 set nodeButton:onClick to nodeButtonPressed@.
 
+local termButton is interface:AddButton("Terminal").
+set termButton:onClick to terminalButtonPressed@.
+
 interface:show().
 
 wait until false.