[R] tcltk2 entry box

[Matthew]

Is anyone familiar enough with the tcltk2 package to know if it is 
possible to have an entry box where a user can enter information (such 
as a path to a file or a number) and then be able to use the entered 
information downstream in a R script ?

The idea is for someone unfamiliar with R to just start an R script that 
would take care of all the commands for them so all they have to do is 
get the script started. However, there is always a couple of pieces of 
information that will change each time the script is used (for example, 
a different file will be processed by the script). So, I would like a 
way for the user to input that information as the script ran.

Matthew McCormack