You can find out when most of the Mersch families immigrated to the United States. You can focus your search to immigration records dating from that era. Immigration records can tell you an ancestor's name, ship name, port of departure, port of arrival and destination.
What is a System Requirements Specification (SRS)? A System Requirements Specification (SRS) (also known as a Software Requirements Specification) is a document or set of documentation that describes the features and behavior of a system or software application.
The sound-bite answer is that requirements are what your program should do, the specifications are how you plan to do it. Another way to look at it is that the requirements represent the application from the perspective of the user, or the business as a whole. The specification represents the application from the perspective of the technical team.