prompt

String expression displayed as the message in the dialog box. The maximum length of prompt is approximately 1024 characters, depending on the width of the characters used. If prompt consists of more than one line, you can separate the lines using a carriage return character (Chr(13)), a linefeed character (Chr(10)), or carriage return–linefeed character combination (Chr(13) & Chr(10)) between each line.

title

String expression displayed in the title bar of the dialog box. If you omit title, the application name is placed in the title bar.

default

String expression displayed in the text box as the default response if no other input is provided. If you omit default, the text box is displayed empty.

xpos

Numeric expression that specifies, in twips, the horizontal distance of the left edge of the dialog box from the left edge of the screen. If xpos is omitted, the dialog box is horizontally centered.

ypos

Numeric expression that specifies, in twips, the vertical distance of the upper edge of the dialog box from the top of the screen. If ypos is omitted, the dialog box is vertically positioned approximately one-third of the way down the screen.

helpfile

String expression that identifies the Help file to use to provide context-sensitive Help for the dialog box. If helpfile is provided, context must also be provided.

context

Numeric expression that identifies the Help context number assigned by the Help author to the appropriate Help topic. If context is provided, helpfile must also be provided.

When both helpfile and context are supplied, a Help button is automatically added to the dialog box.

If the user clicks OK or presses ENTER, the InputBox function returns whatever is in the text box. If the user clicks Cancel, the function returns a zero-length string ("").

The following example uses the InputBox function to display an input box and assign the string to the variable Input:

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

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Reference