NCPWOP could be exercised at any time.
You can look it up here:
http://www.asx.com.au/asx/research/CompanyInfoSearch.jsp
Type in your stock, then follow the warrants link. Style "A" is American exercise (any time during the warrant life at the holder's choosing). "E" is European (only on expiry).
On the ASX site there is also a very good free tutorial on warrants.
