I have been submitting W-2s to the BSO services online. When you create the W-2 file and click the transmit button from within the IRS system, it will close the program. However, when you go back into the IRS system and check to see if it created the file, it does create it. It does not print the transmittal form 6559 which I like to have because it has the client name and file name together. I have been keeping track of the created file names on an excel spreadsheet. You can also print a list of transmittal files created within the IRS system by clicking the ELECTRONIC FILING button, TRANSMIT FORMS, and if there are no pending creations, it gives you a message "no forms found to process....". Click OK, then click the REVIEW PROCESSED FILES tab, it will give you a comprehensive list of files created with the .DAT file name. I am assuming the 1099s will file the same.