There have been several shared-memory extensions written for Tcl,
including
   * [David Welton]'s tclshmem [http://www.dedasys.com/freesoftware/files/tclshmem.c]
   * David's libmm-based one, called TclMM [http://www.dedasys.com/freesoftware/files/TclMM.tgz]
   * [Till Immanuel Patzschke]'s interface to System V shared memory system calls [[email mailto:tip@prs.de for details]]
   * [[list others]]











[[Explain what shared memory is.]]

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See [Inventory of IPC methods] for other ways to let tcl processes communicate.