Hi, I was looking at the guiDDEInstall() documentation for Tinn-R and in the examples there you can generate a list which looks like this where the variable types are shown. a - vector b - vector trees - data.frame This example uses Tcl. Is there a way of generating a similar list using standard commands (i.e. is it an attribute of something like ls())? --------------------------------- --------------------------------- [[alternative HTML version deleted]]