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With little understanding of fork basics here are few more findings on how to vfork implementation in windows operating system and
fork implementation on win32
AT&T Labs Research - Software Tools pick out UWIN: Unix on Windows 95 and NT Machines
Major difference in Linux/Unix functionality and WIN32 applications
Process control and management:
Fork implementation
processes can be created using the fork(2) function, in win32 includes a spawn family of functions that combines the functionality of fork/exec for efficiency.
File descriptor
Open files, pipes, sockets, fifos, and character and block special devices files have file descriptors associated with them. In windows it is called handle.
signals
Most of the unix/linux signals are absent in windows, like SIGALRM
SIGCHLD
SIGHUP
SIGINT
SIGKILL
SIGPIPE
SIGQUIT
SIGUSR1
SIGUSR2
these can be implemented using replacement methods like SIGALRM Time-out alarm can be implemented using SetTimer – WM_TIMER – CreateWaitableTimer
SIGCHLD Change in status of child can be implemented using WaitForSingleObject
Terminal interface for consoles, sockets, and serial lines

sockets based on WINSOCK:

File control locking:

Memory mapping and shared memory
mmap()

System V IPC
semaphore; Shmget can be implemented using CreateFileMaping or
OpenFileMapping
shmdt can be implemented using UnmapViewOfFile
shmat can be implemented using MapViewOfFile
Pipe to _pipe
Close to _close

Runtime linking of dynamically linked libraries : like The dlopen(), dlsym() interface
Error mapping from Windows to UNIX

Symbolic links
Symbolic links to files and directories can be created and can be implemented as Windows shortcuts.

Few Good References for Unix2Win porting

1. Porting Socket Applications to Winsock
2. Process and Thread Functions
3. Winsock Programmer’s FAQ Articles: BSD Sockets Compatibility
4. LibGW32C for GNU C library for Windows
5. Unix to Windows Porting Dictionary for HPC
6. UNIX Application Migration Guide