diff --git a/TN3270Sharp.Example.App/Example3270App.cs b/TN3270Sharp.Example.App/Example3270App.cs
index 7bf3a1e..96c06eb 100644
--- a/TN3270Sharp.Example.App/Example3270App.cs
+++ b/TN3270Sharp.Example.App/Example3270App.cs
@@ -73,6 +73,7 @@ public void CreateServer()
                             var fName = screens[ProgramScreen.FormScreen].GetFieldData("fname");
                             var lName = screens[ProgramScreen.FormScreen].GetFieldData("lname");
                             var password = screens[ProgramScreen.FormScreen].GetFieldData("password");
+                            var employeeId = screens[ProgramScreen.FormScreen].GetFieldData("employeeId");
 
                             // Check for errors...
                             string? errorMessage = null;
@@ -82,8 +83,10 @@ public void CreateServer()
                                 errorMessage = "Last Name field is required.";
                             else if (string.IsNullOrWhiteSpace(password))
                                 errorMessage = "Password field is required.";
+                            else if (string.IsNullOrWhiteSpace(employeeId))
+                                errorMessage = "EmployeeId field is required.";
 
-                            if(!string.IsNullOrWhiteSpace(password) && password.Trim().ToUpper() != "ADMIN")
+                            if (!string.IsNullOrWhiteSpace(password) && password.Trim().ToUpper() != "ADMIN")
                                 errorMessage = "Invalid password.";
 
                             if (!string.IsNullOrWhiteSpace(errorMessage))
@@ -109,6 +112,7 @@ public void CreateServer()
                                     screens[ProgramScreen.FormScreen].ClearFieldValue("fname");
                                     screens[ProgramScreen.FormScreen].ClearFieldValue("lname");
                                     screens[ProgramScreen.FormScreen].ClearFieldValue("password");
+                                    screens[ProgramScreen.FormScreen].ClearFieldValue("employeeId");
                                     screens[ProgramScreen.FormScreen].ClearFieldValue("errormsg");
                                 },
                                 formScreenAction);
@@ -160,6 +164,9 @@ private Dictionary<ProgramScreen, Screen> DefineScreens()
             FormScreen.AddText(7,1,"Password  . . . .");
             FormScreen.AddInput(7,20,"password", true);
             FormScreen.AddEOF(7, 41);
+            FormScreen.AddText(8, 1, "Employee ID . .");
+            FormScreen.AddInput(8, 20, "employeeId", numericonly: true);
+            FormScreen.AddEOF(8, 41);
             FormScreen.AddText(9,1,"Press");
             FormScreen.AddText(9,7,"ENTER", true);
             FormScreen.AddText(9,13,"to submit your name.");
diff --git a/TN3270Sharp/Field.cs b/TN3270Sharp/Field.cs
index 47c4875..b620114 100644
--- a/TN3270Sharp/Field.cs
+++ b/TN3270Sharp/Field.cs
@@ -51,6 +51,9 @@ public class Field
     // password input field).
     public bool Hidden { get; set; }
 
+    // NumericOnly indicates if the client only accepts numeric input.
+    public bool NumericOnly { get; set; }
+
     // Color is the field color. The default value is the default color.
     public Colors Color { get; set; }
 
diff --git a/TN3270Sharp/Screen.cs b/TN3270Sharp/Screen.cs
index 237945b..74136eb 100644
--- a/TN3270Sharp/Screen.cs
+++ b/TN3270Sharp/Screen.cs
@@ -95,8 +95,9 @@ public void AddText(int row, int column, string contents, bool intensity = false
     /// <param name="hidden">text is hidden (i.e., password)</param>
     /// <param name="write">is input field writable (true/false)</param>
     /// <param name="underscore">should the input field be underscored (true/false)</param>
+    /// <param name="numericonly">allows only numeric input</param>
     /// <returns></returns>
-        public void AddInput(int row, int column, string name, bool hidden = false, bool write = true, bool underscore = true)
+        public void AddInput(int row, int column, string name, bool hidden = false, bool write = true, bool underscore = true, bool numericonly = false)
         => Fields.Add(new Field
         {
             Column = column,
@@ -107,6 +108,7 @@ public void AddInput(int row, int column, string name, bool hidden = false, bool
             ? Highlight.Underscore
             : Highlight.DefaultHighlight,
             Hidden = hidden,
+            NumericOnly = numericonly,
         });
 
     /// <summary>
@@ -120,11 +122,12 @@ public void AddInput(int row, int column, string name, bool hidden = false, bool
     /// <param name="hidden">text is hidden (i.e., password)</param>
     /// <param name="write">is input field writable (true/false)</param>
     /// <param name="underscore">should the input field be underscored (true/false)</param>
+    /// <param name="numericonly">allows only numeric input</param>
     /// <returns></returns>
     public void AddInput(int row, int column, int length, string name, bool hidden = false, bool write = true,
-        bool underscore = true)
+        bool underscore = true, bool numericonly = false)
     {
-        AddInput(row, column, name, hidden, write, underscore);
+        AddInput(row, column, name, hidden, write, underscore, numericonly);
         AddEOF(row, column + length + 1);
     }
 
@@ -157,6 +160,7 @@ public byte[] BuildField(Field fld)
             buffer.Add((byte)ControlChars.SF);
             buffer.Add((byte)(
                 (fld.Write ? AttribChar.Unprotected : AttribChar.Protected) |
+                (fld.NumericOnly ? AttribChar.Numeric : AttribChar.Alpha) |
                 (fld.Intensity ? AttribChar.Intensity : AttribChar.Normal) |
                 (fld.Hidden ? AttribChar.Hidden : AttribChar.Normal)
                 ));
@@ -179,6 +183,7 @@ public byte[] BuildField(Field fld)
         buffer.Add(0xc0);
         buffer.Add((byte)(
             (fld.Write ? AttribChar.Unprotected : AttribChar.Protected) |
+            (fld.NumericOnly ? AttribChar.Numeric : AttribChar.Alpha) |
             (fld.Intensity ? AttribChar.Intensity : AttribChar.Normal) |
             (fld.Hidden ? AttribChar.Hidden : AttribChar.Normal)
             ));