:   '''[thread]::send''' ?'''-async'''? ?'''-head'''? ''id script'' ?''varname''?

Sends a message to the [thread] described by ''id''. The message consists of a ''script'' that will be [eval]uated in the [global scope] of the master interpreter of that thread. Unless '''-async''' is specified, will wait for the script to be evaluated before allowing the current thread to continue. If ''varname'' is given, the given globally-resolved variable will be set with the outcome of executing the ''script'' in the asynchronous case, which is useful with [vwait] and [trace]. The '''-head''' option places the event at the front of the event queue rather than at the tail (the default), making it higher priority than normal; you hardly ever require this.

More information: [http://tcl.cvs.sourceforge.net/viewvc/tcl/thread/doc/html/thread.html#10%|%manpage]

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