MsgBox

Displays a message in a dialog box, waits for the user to click a button, and returns a value that indicates which button the user clicked

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

Note:

Messages that use the Web client must be displayed in a new window. Therefore, in the Web client, use the Show Message accelerator provided in Workbench Object Browser, not the MsgBox function.