[DUG] Tricky Friday question

[Robert martin]

  Hi All

We use a dll to connect our POS app to various Eftpos systems.  We 
create a dll for each Eftpos system and our software uses a standard set 
of calls to id to access Eftpos.

We are trying to access a new eftpos system where we are required to do 
all printing for the terminal.  our application while open must be 
available at any time to handle print jobs.  I am struggling to see how 
this can be done via a dll, I am thinking that I need to create a 
service that would deal with the POS and have a DLL that acts as a 
middle man between our POS and the service.  Does that sound sensible?  
If I did this should I use TCP/IP for connection or something else (the 
service, dll and app would all be on the same machine).

Any suggestions appreciated :)

Cheers
Rob