You can search for an issue in any of the Classic boards. Simply enter your search criteria in the search box — 'Board Search' — in the top navigation bar and press Enter on your keyboard. GreenHopper will then return any search results that match the search criteria from your board, (not taking your current view into account). For example, if you search for all issues matching "fred" in the 'Fred' project while you have the 'Version'-'Release 4.1' view applied, GreenHopper will return matching issues from all unreleased versions in the 'Fred' project not just 'Release 4.1'.
Your search criteria can be any of the following:
Screenshot: Search box in GreenHopper Classic
If the search finds a single issue, GreenHopper will reload your board focused on that issue. If the search finds multiple issues, GreenHopper will pop up a dialog with all issues found. Your search results will display your issues in the same view that is currently selected on the board. You can interact with the search results in the modal window as follows:
Screenshot: Search results for multiple issues