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diff --git a/pipex.h b/pipex.h
new file mode 100644
index 0000000..e96457f
--- /dev/null
+++ b/pipex.h
@@ -0,0 +1,93 @@
+#ifndef PIPEX_H
+#define PIPEX_H
+#ifdef _WIN32
+
+// WIN32 part
+
+// includes
+
+#include <windows.h>
+#include <stdio.h>
+#include "util.h"
+
+// defines
+
+#define PIPEX_EOF (1<<0)
+#define PIPEX_ACTIVE (1<<1)
+
+// This should be bigger than the maximum length of an engine output or GUI
+// input line.
+
+#define LINE_INPUT_MAX_CHAR 4096
+
+// types
+
+typedef struct {
+    HANDLE hProcess;
+    HANDLE hEvent;
+    HANDLE hInput, hOutput;
+    FILE *fpInput;
+    HANDLE hThread;
+    BOOL bConsole;
+    BOOL bPipe;
+    CRITICAL_SECTION CriticalSection;
+    volatile DWORD state;
+    volatile char * lpFeedEnd;
+    volatile int nReadEnd;
+    char lpBuffer[LINE_INPUT_MAX_CHAR];
+    char lpReadBuffer[LINE_INPUT_MAX_CHAR];
+    const char *name;
+
+} pipex_t;
+
+#else
+
+// POSIX part
+
+// includes
+
+#include <sys/types.h>
+#include <unistd.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+
+
+#include "io.h"
+#include "util.h"
+
+// defines
+
+#define PIPEX_EOF (1<<0)
+#define PIPEX_ACTIVE (1<<1)
+
+// types
+
+typedef struct {
+    io_t io[1];
+    pid_t pid;
+    int state;
+} pipex_t;
+
+#endif
+
+// part common to WIN32 and POSIX
+
+// functions 
+
+extern void pipex_open         (pipex_t *pipex, 
+                                const char *name,
+                                const char *command);
+extern bool pipex_active       (pipex_t *pipex);
+extern bool pipex_readln       (pipex_t *pipex, char *string);
+extern bool pipex_readln_nb    (pipex_t *pipex, char *string);
+extern void pipex_writeln      (pipex_t *pipex, const char *string);
+extern bool pipex_eof          (pipex_t *pipex);
+extern void pipex_send_eof     (pipex_t *pipex);
+extern void pipex_exit         (pipex_t *pipex);
+extern void pipex_set_priority (pipex_t *pipex, int value);
+extern void pipex_set_affinity (pipex_t *pipex, int value);
+extern void pipex_wait_event   (pipex_t *pipex[]);
+
+// pipex
+
+#endif