append the current coordinate to a file whose name is given by the GV.saveposFilename resource.
<U>
enter a command with the current coordinate as its default parameter. By defalt it is
% TODO
\PutAtPos(x,y)(), where x,y are the current coordinate and the user can put needed commands into ().
This command is appended to a file whose name is given by the GV.saveposFilename resource.