This command is part of the [TclX] pacakge.
    :   '''funlock''' ''fileId'' ?''start''? ?''length''? ?''origin''?

Remove a lock from a file that was previously placed with  the [flock] command.  The arguments are the same as for the flock command, see that command for more details.

The funlock command is not  available  on  Windows  95.   It  is available on Windows NT.
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There is no funlock in Tcl...

... but there is in [TclX].

... and there is the proposal [tclx file commands for core]
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!!!!!!
%| [Category Command] | [Category TclX] |%
!!!!!!