system.gui.showTouchscreenKeyboard(initialText, [fontSize], [passwordMode])
String initialText - The text to start the on-screen keyboard with.
Integer fontSize - The font size to display in the keyboard. [optional]
Boolean passwordMode - A
True value will activate password mode, where the text entered is not echoed back in cleartext. [optional]
String - The text that was entered in the on-screen keyboard.