Apparently, I was able to find an answer.
https://example.com/somedepartment/sample.nsf/page/hello+world?OpenDocument&RandomParam=sample
Now I could pass values by means of this format. Basically it has to be preceded by "OpenDocument" parameter before putting custom ones.
This documentation also helps: http://www.ibm.com/developerworks/lotus/library/ls-Domino_URL_cheat_sheet/