ask is a command to create a ready to use window with a field:
ask "What is your name?"
The text entered by the user is stored in the it variable.
Moreover you can add an icon, Livecode has the following predefined icons:
ask information "What is your name?"
If you use some HTML tag, the text is intepreted as HTMLText. Use this feature to customize text.
This is the syntax:
ask [iconType] prompt [with defaultResponse] [titled windowTitle] [as sheet]