Tcl_SourceRCFile - source the Tcl rc file

       Tcl_Interp *interp (in)          Tcl interpreter to source rc file into.
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Tcl_SourceRCFile  is  used  to source the Tcl rc file at startup.  It is typically invoked by Tcl_Main or
       Tk_Main.  The name of the file sourced is  obtained  from  the  global  variable  tcl_rcFileName  in  the
       interpreter  given  by  interp.   If  this variable is not defined, or if the file it indicates cannot be
       found, no action is taken.

       application-specific initialization, main program, rc file

Tcl                                                    8.3                                Tcl_SourceRCFile(3tcl)

       Tcl_SourceRCFile - source the Tcl rc file

#include<tcl.h>Tcl_SourceRCFile(interp)