acet-ui-progress-safe

(acet-ui-progress-safe  messageOrPosition)

If messageOrPosition is a string, the new message text is displayed for the progress meter, and position is reset as 0;
if messageOrPosition is an integer number, the progress meter is updated to specified position :positive value positions the progress meter to the absolute position, negative values are meant is increments.

Returns T/NIL if message text is updated, or the actual position value.