Win4Lin emulates a standard PC environment, so when you are running Win4Lin you are running a real' copy of Windows. You can install and remove Windows software just as you would with a normal' Windows setup.
Since it is Windows, many programs written for Windows will not notice the different environment. Word processing, spreadsheets and even compilers will run under Win4Lin. This means that users need not migrate all office suite documents to the corresponding Linux-based packages until they are happy with the new environment, or find a suitable alternative.
Win4Lin will also run Winsock TCP/IP. Therefore, any TCP/IP-based Internet tool that runs under Windows will also work with Win4Lin.