Signals can be sent to processes or to process groups. Support for devices UWIN provides character and block devices with major and minor numbers as found on UNIX systems. Serial lines, and sockets that have been designated as virtual terminals. UWIN supports pseudo-ttys. The left mouse button in a console window can be used to select text and copy to the clipboard.
Sockets are file descriptors and obey file descriptor semantics.
The multicast socket protocol is supported. The connect stream library, which provides a higher level and easier to user interface, is also provided. An API function is provided to map the UNIX name into the Windows NT name. The mapping is available from ksh as well. The cc command generates files with a .