%SCRIPTURL{"script"}%
http://www.subject.ch/twiki/subject/bin/script
%SCRIPTURL{"viewauth"}%/%WEB%/%TOPIC% which expands to http://www.subject.ch/twiki/subject/bin/viewauth/TWiki/VarSCRIPTURL2
%SCRIPTURLPATH{"script"}% instead, as it works with URL rewriting much better