Oracle8i and SQL Server 6.5 connections in the same session

Can Oracle8i and SQL Server 6.5 database connections be used within the same
session in a continuously reliable manner (like in a server-side process
that runs continuously)?  Or is this not a good idea?  I've noted some
degree of flakiness (occasional system crashes) before separating out the
connections into separate sessions.

By the way, I'm developing with Delphi 4SP3 C/S and BDE 5.10 (+ Oracle
driver update).