Using multiple .EXEs with one ODBC database connection?

We are developing a client/server product which uses several modules
(.EXEs) and ODBC.  These modules are launched from a main executable.  What
would be the best way to use the same database connection (established from
main .exe) for all modules without having to re-enter username, password
for each module after it is launched.  We must be able to have different
user logons to the database.

Richard P. Webb