This patch replaces Mathematica's local MathLink protocol, and allows Mathematica to run on a Windows 95 system without the installation of TCP, which was previously necessary. To install the patch: 1) Copy the file MLLCL16.MLL, which you downloaded from MathSource, into the Mathematica directory (usually called WNMATH22). Windows 95 will ask you to confirm the replacement of the existing MLLCL16.MLL with the new one. Click Yes to confirm the replacement. If you receive the error messages "The specified file is being used by Windows" or "Access denied", reboot your system and try again. 2) In the Windows 95 directory, look for the file MATHLINK.INI (in the Explorer, it's listed with the name Mathlink and the type Configuration Settings). Delete this file. 3) Run the Mathematica front end (FRONTEND.EXE), but do not do any calculations, yet. 4) Under the Options menu, click Kernel. Click the Protocols button, then the Add button, then the Browse button. At this point, you should see a listing of files, including the file MLLCL16.MLL. Choose that file and click OK three times until you get back to the Kernel Options dialog box. 5) Click the Specific Kernel radio button. Then click the Edit button. This brings up the Define A Kernel dialog box with the Local kernel. Under Link Protocol, choose Local. Click OK to exit the Define A Kernel dialog box, then click OK to exit the Kernel Options dialog box. The protocol is now installed and may be used. A few notes about the new protocol: * The new protocol is compatible with Windows 3.1 and Win-OS2 running under Warp, as well. For those running a dual or tri-boot system with Windows 95 and Windows 3.1 or OS/2, install the protocol under Windows 95, and your Windows or Win-OS2 installation of Mathematica should continue to work normally. * The new local protocol will not work under Windows NT. It also does not work with the native OS/2 version of Mathematica. For both of those versions, you will still need TCP installed. * If you are a MathLink programmer, and you wish to create 32-bit MathLink programs, you must continue to use TCP under Windows 95. However, any 16-bit MathLink program should run normally using the Local protocol under Windows 95. * Any questions about installing the new protocol should be directed to the Technical Support department at Wolfram Research. Technical Support can be contacted via e-mail at support@wri.com, by phone at (217) 398-6500, or by fax at (217) 398-0747. Please include your license number and a full description of the problem.