diff --git a/rtl/win16/win31.pp b/rtl/win16/win31.pp
index f0a251904e..85c8d148f5 100644
--- a/rtl/win16/win31.pp
+++ b/rtl/win16/win31.pp
@@ -551,6 +551,23 @@ type
   end;
   TWindowPos = WINDOWPOS;
 
+const
+{ Window drawing support }
+  DCX_WINDOW           = $00000001;
+  DCX_CACHE            = $00000002;
+  DCX_CLIPCHILDREN     = $00000008;
+  DCX_CLIPSIBLINGS     = $00000010;
+  DCX_PARENTCLIP       = $00000020;
+
+  DCX_EXCLUDERGN       = $00000040;
+  DCX_INTERSECTRGN     = $00000080;
+
+
+  DCX_LOCKWINDOWUPDATE = $00000400;
+
+
+  DCX_USESTYLE         = $00010000;
+
 function GetFreeSystemResources(SysResource: UINT): UINT; external 'USER';
 
 procedure LogError(err: UINT; lpInfo: FarPointer); external 'KERNEL';
@@ -713,6 +730,15 @@ procedure MapWindowPoints(hwndFrom, hwndTo: HWND; lppt: LPPOINT; cpt: UINT); ext
 procedure MapWindowPoints(hwndFrom, hwndTo: HWND; var pt: POINT; cpt: UINT); external 'USER';
 {$endif}
 
+{ Window drawing support }
+{ note: the first parameter in this function is declared 'register' in windows.h, even though
+        the calling convention of the function is 'pascal'
+  todo: figure out whether the first parameter really needs to be passed in register, or
+        whether the 'register' modifier is ignored by 16-bit C compilers, when the calling
+        convention is 'pascal'.
+ }
+function GetDCEx({register} hwnd: HWND; hrgnClip: HRGN; flags: DWORD): HDC; external 'USER';
+
 implementation
 
 end.
diff --git a/rtl/win16/winprocsh.inc b/rtl/win16/winprocsh.inc
index 6bbc93b4b9..785cfd65df 100644
--- a/rtl/win16/winprocsh.inc
+++ b/rtl/win16/winprocsh.inc
@@ -923,3 +923,18 @@ function GetTopWindow(hwnd: HWND): HWND; external 'USER';
 
 function GetWindow(hwnd: HWND; fuRel: UINT): HWND; external 'USER';
 function GetNextWindow(hwnd: HWND; uFlag: UINT): HWND; external 'USER';
+
+{ Window property support }
+
+function SetProp(hwnd: HWND; lpsz: LPCSTR; hData: HANDLE): BOOL; external 'USER';
+function GetProp(hwnd: HWND; lpsz: LPCSTR): HANDLE; external 'USER';
+function RemoveProp(hwnd: HWND; lpsz: LPCSTR): HANDLE; external 'USER';
+
+function EnumProps(hwnd: HWND; prpenmprc: PROPENUMPROC): SmallInt; external 'USER';
+
+{ Window drawing support }
+
+function GetDC(hwnd: HWND): HDC; external 'USER';
+function ReleaseDC(hwnd: HWND; hdc: HDC): SmallInt; external 'USER';
+
+function GetWindowDC(hwnd: HWND): HDC; external 'USER';
diff --git a/rtl/win16/wintypes.inc b/rtl/win16/wintypes.inc
index 7df4668014..6f697107bf 100644
--- a/rtl/win16/wintypes.inc
+++ b/rtl/win16/wintypes.inc
@@ -1630,3 +1630,7 @@ const
   GW_HWNDPREV  = 3;
   GW_OWNER     = 4;
   GW_CHILD     = 5;
+
+type
+{ Window property support }
+  PROPENUMPROC = function(hwnd: HWND; lpsz: LPCSTR; hData: HANDLE): BOOL; far;