Tested on SPSS 18.0 (I mean, cough cough, PASW 18.0) on a Windows 7 x64 machine.
Tested with limited success on SPSS 15.0: Variables can only be selected in a continuous block (which makes it considerably less useful)
SPSS is a registered trademark and subsidiary owned by IBM. PASW is a registered trademark of SPSS Inc. This project and its author are not affiliated with SPSS or IBM. This project contains no code from SPSS and does not make use of its API (currently). Etc., etc.