With rabbits, a common myth is that if you touch a baby rabbit the mother will no longer care for it. 9 times out of 10, the mother will return to care for the babies after they have been handled.
QNX is not a Linux distribution, normal or otherwise. QNX is POSIX compliant. That means that much of the programming interface and many of the utilities are the same. The underlying OS is very different in structure. There is little compatibility for drivers. With Linux the operating system functions as a very large monolithic piece of code.
OPC to Linux / QNX. The OPC DataHub enables any OPC Server to write data to a relational database such as Access, MS SQL Server, Oracle or any other ODBC compliant database. You can also read data from an ODBC database and use it as input to any number of different OPC Servers or Clients.