Uses a graphics cursor to change the current picture PICCUR
[The current graphics device] "DATA". A null (!) or blank string means that
pictures of all names may be selected. [!] TRUE
then the user can supply only one position using the cursor, where-upon the
application immediately exits, leaving the selected picture as the current picture.
If FALSE is supplied, then the user can supply multiple positions. Once all
positions have been supplied, a button is pressed to indicate that no more
positions are required. [FALSE] Nothing is displayed on the screen when the message filter environment variable
MSG_FILTER is set to QUIET.