About( )

Displays the About message box.

AskDirectory(prompt, browse-root, start-dir, confirm-prompt, flags)

Displays a directory browse dialog box, and returns the selected directory name.

AskFileName( title, directory, filetypes, default filename, flag )

Returns the filename as selected by a FileOpen dialog box.

AskItemlist( title, list, delimiter, sort mode, select mode [, selection-required] )

Allows the user to choose an item from a list box initialized with a list variable.

Debug( mode [, init-string] )

Turns the Debug mode on or off.

DebugData( string, string )

Writes data via the Windows OutputDebugString function
to the default destination.

DebugTrace (requestcode [ ,parm1 [, parm2 ]] )

Controls and customizes the WIL debugging trace logs.

Dialog( dialog-name [, ignore-flag] )

Displays a user-defined dialog box. 

Display( seconds, title, text )

Momentarily displays a string.

Message( title, text )

Displays text in a message box.

Pause( title, prompt )

Displays text in a message box.

Terminate( condition, title, text )

Conditionally ends a WIL program.