Parallels Toolbox for Mac and Windows 30+ tools in a lightweight, powerful, all-in-one application for Mac ® and PC. Easy to use and economical—a whole suite of tools for a fraction of the cost of individual apps, packaged in one simple interface.

Parallels only supports OS's that run on Intel CPU hardware, which excludes OS 9. Install drive for mac. You would have to run an OS 9 emulator in Windows or Linux, by which time you may already be too far from your client's set-up to get useful results. OS 9 is now at least seven years old, and compatible browsers (usually IE and Netscape.) are very old versions, with version numbers around 4. If you are using any AJAX in your development, just as one example, then I somehow doubt if any browser for OS 9 will handle it.

Most CSS is probably a no-no as well. You don't need to run MacOS9 as a virtual machine under parallels. You can run it directly on an intel Mac (or other intel computers if you like) using 'Sheepsaver'; google 'SheepSaver' for more information. ====== SheepShaver is an Open Source PowerPC MacOS run-time environment. That is, it enables you to run PowerPC Classic MacOS software on your computer, even if you are using a different operating system. However, you still need a copy of MacOS and a PowerMacintosh ROM image to use this program.

SheepShaver is distributed under the terms of the GNU General Public License (GPL). ====== I'm running it right now on my macbookpro and it works well enough for what I need.