Thanks B, did not understand 1st link, what is netbeans?
and 2nd link what Virtual Machine? Did not get that.. Mac based? Is free or cost?
NetBeans is an IDE (DW alternative) it is free and allows us to create HTML, CSS, JS, PHP, SQL, JSON...also handle project, FTP, and much more
a virtual machine makes it possible to create as much configuration as one wishes. it can install as many OS as you want ... eg W2000, XP, W7, Ubuntu, Slakware, Debian .... etc ... all are independent and use the capabilities of the machine (graphics cards, networks, pheripherals, USB, networks ... etc ...) but remaining confined in its virtual space (thus completely independent of the host system) ...
Virtual Box is free ... but it requires to have the rights of the installed system ... regarding MacOS ... Mac OS can not be installed as a virtual machine on a system other than MacOS ... (limitation set up by apple) ... but hey you're on Mac ... so no legislative problem ...
so you maintain the MacOS evolution of your host machine and install an old MacOS system suitable for DW in virtual machine