SilentLog is a keystroke logging tool that runs under several Windows 32 versions (it should also run under NT). The best of it's features is it's small size: only 7 KB compiled. (But it's NOT a DOS program, it uses 32Bit-Windows). The source code (FASM assembly syntax) is included. The executable also contains a DLL which it recreates when loaded. (So the real sizes are 3 KByte executable and 4 KByte for the DLL). The program logs all standard keys (the return key is also processed correctly). See Readme.txt included.
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