Most of the vast holdings of the LDS Family History Library cannot be accessed by the web. Only the index of the holdings is available. You would need to identify film numbers and then order the films on loan at an LDS Library near you.
The web site for the place index is at http://www.familysearch.org/Eng/Library/FHLC/frameset_fhlc.a...
Enter Heiligenkreuz, Eltendorf and Konigsdorf as place names and see what you'll get.
For the residency records of Vienna, enter Wien as the place name. From the long list you will get, click Wien in Niederosterreich, Austria. In the index for Vienna/Wien, click Population, then Meldezettel (male and female) for 1850-1928. The Meldezettel cover really only about 1898 till 1923, but this would be the key period for you anyway.
You will be overwhelmed by the amount of films and the length of the index. Read well the explanation of the filing system. If you do order films, you will inevitably often order the wrong ones. It happened to me many times. Searching will consume much time. If you decide to go through this, I'll be happy to give you more advice.
Alternatively, you could try to e-mail to the Wiener Stadt- und Landesarchiv. Ask whether they could search the residency records for your Kreinecker and Matzka relatives. The e-mail address I have at the archive's web site is firstname.lastname@example.org
. The web site itself is at http://www.wien.gv.at/english/history/archives/ancestors.htm...
Have you considered hiring a professional genealogist?