A '''R'''emote '''P'''rocedure '''C'''all, which builds on some form of [ipc%|%inter-process
communication], provides a mechanism for calling a procedure in a program running on a remote system is
called. 



** Description **

The big command in this area is Tk's `[send]`, which uses [X] server resources to communicate scripts and their results between processes (or more precisely, between Tcl interpreters which have Tk loaded). IPC packages such as [comm] emulate send's API.

Macintosh, of course has [Applescript] (see also [Applescript and legacy applications]) and [TclAE].  
Both work by sending AppleEvents (AEs) to target applications. The difference is that TclAE lets you construct the AE directly using Tcl commands, whereas Applescript is a separate scripting language whose '''tell''' command constructs an AE and sends it.

A system of [Linux] origin is [DBUS%|%D-Bus%|%], where the bus is operated by a daemon process that several parties may connect to. Underlying mechanisms include (but are not limited to) unix sockets and TCP/IP sockets, but that level is usually seen only by the standard D-BUS library, which provides a message passing interface.



** Tcl RPC Systems **

   [comm]:   A [socket]-based send.  Now a part of [tcllib].

   [TclSOAP]:   

   [dp_RPC]:   A [pure-Tcl] replacement for [Tcl-DP]

   [send]:   A [Tk] command to execute a command in a different application.

   [SIMPL]:   Send/Receive/Reply a-la QNX.

   [Tcl-DP]:    Adds [TCP], [UDP], IP-multicast connection management, remote procedure call (RPC), serial communication and distributed object protocols to Tcl. A C API allows non-Tcl RPC clients to send commands to an RPC server and receive responses.

   [Scotty]'s [UDP]:   Need some clarification on why this should be listed here.
   [ftp://ftp.tcl.tk/pub/tcl/mirror/ftp.procplace.com/alcatel/extensions/tclipc1-0.tar.gz%|%tclipc1-0.tar.gz]:   

   [winsend]:   Uses Windows [COM] to implement send.

   Tk[pvm]:   Claims to do something along this line.



** General RPC Protocols **

There are Tcl implementations of many of the following protocols 

   [CORBA]:   

   [JSON-RPC]:   

   [XML-RPC]:   

   [SOAP]:   

   [WSDL]:   



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