diff --git a/basis/tools/ps/windows/windows.factor b/basis/tools/ps/windows/windows.factor
index 97b21b38b4..f35eb5a4f4 100644
--- a/basis/tools/ps/windows/windows.factor
+++ b/basis/tools/ps/windows/windows.factor
@@ -1,4 +1,76 @@
-USING: system tools.ps ;
+USING: accessors alien alien.c-types alien.data alien.syntax
+arrays byte-arrays classes.struct destructors fry io
+io.encodings.string io.encodings.utf16n kernel literals locals
+math nested-comments sequences strings system tools.ps
+windows.errors windows.handles windows.kernel32 windows.ntdll
+windows.types ;
 IN: tools.ps.windows
 
-M: windows ps ( -- assoc ) { } ;
+: do-snapshot ( snapshot-type -- handle )
+    0 CreateToolhelp32Snapshot dup win32-error=0/f ;
+
+: default-process-entry ( -- obj )
+    PROCESSENTRY32 <struct> PROCESSENTRY32 heap-size >>dwSize ;
+
+: first-process ( handle -- PROCESSENTRY32 )
+    default-process-entry
+    [ Process32First win32-error=0/f ] keep ;
+
+: next-process ( handle -- PROCESSENTRY32/f )
+    default-process-entry [ Process32Next ] keep swap
+    FALSE = [ drop f ] when ;
+
+: open-process-read ( dwProcessId -- HANDLE )
+    [
+        flags{ PROCESS_QUERY_INFORMATION PROCESS_VM_READ }
+        FALSE
+    ] dip OpenProcess ;
+
+: query-information-process ( HANDLE -- PROCESS_BASIC_INFORMATION )
+    0
+    PROCESS_BASIC_INFORMATION <struct> [
+        dup byte-length
+        f
+        NtQueryInformationProcess drop
+    ] keep ;
+    
+:: read-process-memory ( HANDLE alien offset len -- byte-array )
+    HANDLE
+    offset alien <displaced-alien>
+    len <byte-array> dup :> ba
+    len
+    f
+    ReadProcessMemory win32-error=0/f
+    ba ;
+
+:: read-args ( handle -- string/f )
+    handle <win32-handle> &dispose drop
+    handle query-information-process :> process-basic-information
+    handle process-basic-information PebBaseAddress>>
+    [
+        0x10 PVOID heap-size read-process-memory
+        PVOID deref :> args-offset
+        args-offset ALIEN: 0 = [
+            f
+        ] [
+            handle args-offset 0x40 UNICODE_STRING heap-size read-process-memory
+            [ handle ] dip
+            UNICODE_STRING deref [ Buffer>> 0 ] [ Length>> ] bi read-process-memory
+            utf16n decode
+        ] if
+    ] [ drop f ] if* ;
+    
+: process-list ( -- assoc )
+    [
+        TH32CS_SNAPALL do-snapshot
+        [ <win32-handle> &dispose drop ]
+        [ first-process ]
+        [ '[ drop _ next-process ] follow ] tri
+        [
+            [ th32ProcessID>> ]
+            [ th32ProcessID>> open-process-read dup [ read-args ] when ]
+            [ szExeFile>> [ 0 = ] trim-tail >string or ] tri 2array
+        ] map
+    ] with-destructors ;
+
+M: windows ps ( -- assoc ) process-list ;