[TxMt] Ability to set selection from a command

[Matthew Gilbert]

Hi All,

I have frequently wanted the ability to replace some text in the  
current document and set the selection through a command. Is this  
possible? I can easily replace the entire document, but setting the  
selection eludes me.

In addition, I'd like access to the column number along with the line  
number. I didn't see this as one of the exported environment  
variables. Allen/all, any suggestions? Thanks _matt