This must be dumbest question ever asked, but...
When I ask help.search("tcltk"), I get a reference to tcltk-package.
When I ask help("tcltk-package"), I get "rtfm(s) in 'R_HOME/Tcl/doc'".
But then when I ask help.search("R_HOME"), I get nothing.
Is something missing here in those help pages?
Alberto Monteiro