Nothing
"security"<-function(){
if (length(txt4)==1 & length(txt1)==1 & length(txt2)==1) tkmessageBox(message="Error. Please, load before at least 2 databases")
if (length(txt4)==1 & length(txt1)==1 & length(txt2)==1) stop()
if (length(txt4)==1 & length(txt1)==1 & length(txt3)==1) tkmessageBox(message="Error. Please, load before at least 2 databases")
if (length(txt4)==1 & length(txt1)==1 & length(txt3)==1) stop()
if (length(txt4)==1 & length(txt3)==1 & length(txt2)==1) tkmessageBox(message="Error. Please, load before at least 2 databases")
if (length(txt4)==1 & length(txt3)==1 & length(txt2)==1) stop()
}
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