README file for MSM-XCALL for MSM for Windows NT
     and MSM-Workstation
     ================================================

     March 31, 1998

     These release notes are intended to supplement the MSM-XCALL
     User's Guide.  Various platform-specific instructions for
     installation and usage are included in this document.

     You should have received a manual entitled MSM-XCALL User's Guide.

     This directory contains the following files in addition to this one:

       xcdef.h     - required when compiling the C source file generated
                     by XCALLMGR.
       example.c   - source for an example XCALL package, which is listed
                     in Appendix B of the User's Guide.
       example.pac - the exported XCALLMGR definition of the example XCALL
                     package.
       xcall.def   - a sample export definition file to export the xcfiles
                     name.

     Your xcall package must be linked as a DLL. The only name that must be
     exported from the package is xcfiles. You may export other names if the
     DLL will be called by applications other than MSM.  The DLL file is the
     one that must be loaded by MSM to make the xcall package available.
     The DLL must include your xcall function code and the C source file that
     is generated by XCALLMGR.

     Please note the following restrictions.

     1. The XCALL C code written by the user must NOT contain the function
        main().

     2. While an XCALL is being executed, all other MSM processes will be
        suspended until the XCALL completes.

     3. Many C library functions will not work correctly because library
        initialization that is normally associated with the main() entry
        point will not be performed.

     If you have any questions or problems with this package, please
     contact the Micronetics MSM Technical Support Department.