print shares and AD with 2 domains

hi all I have 2 domains currently set up. one is mercycardio the other is mcc. the domains have a 2 way trust set up.  mcc is the new domain that I am slowly migrating all the client boxes over to. the trouble I am having is this. I have a dos program that needs to be able to print via network the print server is on the mercycardio network. it works fine when I capture the printer port to a client on mercycardio domain BUT if I try to capture it to one of the clients I have moved over to the mcc domain I get asked a password for the print server. I am not really sure what I need to do... maybe write in the batch to put the username and pw in every time it loads? or can I do it using AD and set the person as a print user or? at this point I am out of ideas... thanks agian all