initialise projects

WindowsFormsPopupKeyboard/WindowsFormsApplication3/keyboard.cs

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+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Data;
+using System.Drawing;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Forms;
+
+namespace WindowsFormsPopupKeyboard
+{
+    public partial class Keyboard : Form
+    {
+        TextBox tt;        
+
+        public Keyboard()
+        {
+            InitializeComponent();
+            this.TopMost = true;  // make the keyboard always in front of the other forms
+        }
+
+        public void setTextBoxForOutput(TextBox t)
+        {
+            tt = t;  // 
+        }
+
+
+        private void button_Click(object sender, EventArgs e)
+        {
+                
+             tt.Text += ((Button)sender).Text;
+        }
+    }
+}