FRAME_W32_P A frame using native MS-Windows GUI.
FRAME_WINDOW_P A GUI frame (like X, w32, etc.)
+** Support for accessing other processes on the system **
+
+HAVE_PROCFS The /proc filesystem is supported.
+LISTPROC A function that returns a list of PIDs of system processes.
+PROCATTR A function that returns attributes of a process.
+
** Compile-time options **
+
REL_ALLOC Compile in the relocatable memory allocator ralloc.c.
SYSTEM_MALLOC Use the system library's malloc.
subprocesses System can use subprocesses (for M-x shell for example). Defined by default, only MSDOS undefines it.