The OPS online version is compiled from approx. 100 single files which are inter-linked extensively to ensure comfortable navigation. The integrated code-search enables fast location of the code you are looking for.
The OPS online version is only available in German language.
Textsearch can be accessed via the hot keys ctrg+f. If you want to search the whole classification you can do so for with the DIMDI-Websitesearch.