Hi Brenda.

>> How to tell if they entered a valid filename? What are the limitations? Only alpha and numeric? They are entering a file name in a textbox (the file may not exist) and I want to check it for being valid. <<

Depending on what you are trying to do here, you may find that PUTFILE() will already handle much of the work for you. You can get the details of the PUTFILE() function in the on-line help.

Marcia