Even though automated testing scripts are intended to communicate with application under test there are cases when communication with tester is required. With QTP, we can use either built-in MsgBox / InputBox functions or link standard Windows dialogs through COM.

MsgBox

Use this function to report information (like value of a variable) during debugging or to report a critical issue that caused test execution to stop.

MsgBox(prompt[, buttons][, title][, helpfile, context])

'Example.
Dim MyVar
MyVar = MsgBox ("Hello World!", 65, "MsgBox Example")
' MyVar contains either 1 or 2, depending on which button is clicked.

For a complete description please refer to Quick Test Professional Help.

InputBox

Use this function to ask a tester to input a short simple value, like environment name. Do not use InputBox dialog for a long text input, like file path, or complex data input, like username/password.

InputBox(prompt[, title][, default][, xpos][, ypos][, helpfile, context])

'Example
Dim Input
Input = InputBox("Enter your name")
MsgBox ("You entered: " & Input)

For a complete description please refer to Quick Test Professional Help.

Custom Dialogs

If you want to create a custom dialog using DotNetFactory – please refer to the following article.

Standard Dialogs – MSComDlg

The MSComDlg component could be used to display several types of dialogs: open file, save file, printer, color and font dialogs.

'Example
Dim CDLG
Set CDLG = CreateObject("MSComDlg.CommonDialog")
  With CDLG
    .DialogTitle = "Get me a File!"
    .Filter = _
      "Documents|*.doc|Templates|*.dot|Text Files|*.txt"
    .ShowOpen
    MsgBox .FileName
  End With
  Set CDLG = Nothing

You can refer to the following resource for additional information: MSDN Article Enhance Your Apps with Common Dialogs

You may experience a licensing issue with this control if you don’t have Visual  Studio installed on the machine executing the code that uses MSComDlg. To resolve the issue please refer to the article or use another dialog component.

Standard Dialogs – UserAccounts

The UserAccounts component is available in Windows family beginning from Windows XP.

'Create Dialog
Set objDialog = CreateObject("UserAccounts.CommonDialog")
objDialog.Filter = "Test Plan Spreadsheets|*.xls" 
objDialog.FilterIndex = 1 
objDialog.InitialDir = "C:\Test Suite\Test Plans" 
'Show Dialog
intRC = objDialog.ShowOpen 
sTestPlan = objDialog.FileName
'release
Set objDialog = Nothing

You can refer to the following resource for additional information and step-by-step explanations: How Can I Show Users a Dialog Box for Selecting Files?