Categories!
It's kinda like "Look in 'this' folder Only" sorta thing. It narrows the search down.
In the Console, look on the Folders to Index tab and tell me what you've got in there. Is it just one folder or ALL of your folders?
Imagine this scenario:
5000 Drawings are located in different directories under C:\Drawings. You
could index the entire C:\Drawings directory but if you searched for a common word, you'd end up with more results than you want. If you knew that the drawing you're searching for should (or should NOT) be located in a certain directory, you could select that category and search only in there.
C:\Drawings\Dir1
C:\Drawings\Dir2
C:\Drawings\Dir3
C:\Drawings\Dir4
C:\Drawings\Dir5
~~~etc.~~~
Create a category for each subdirectory. You can then decide to search through ALL categories or select just one at a time.
More confused or Less Confused?
PS - How many times have you returned 100 search results? That limit is in the address bar. If you want to increase the number of search results, change
http://10.100.16.28/?frm=simple&nres=100&q=test&cat=&fmt=Preview
to
http://10.100.16.28/?frm=simple&nres=1000&q=test&cat=&fmt=Preview