Pressing Alt+3 will unset the user bookmark at the current position of the display, if one is set there. This removes the bookmark from the cycle, so that F2 and Shift+F2 no longer include that position. The current bookmark becomes the next one in the cycle.
Pressing Alt+3 at a position that is not bookmarked has no effect.
You can press Control+Alt+3 to clear all user bookmarks, if any. This will unset all the user bookmarks that are currently set, so that none of the user bookmark navigation commands have any effect until a new bookmark is created.
Note that the return bookmark cannot be cleared, only reset to a new position.
Page url: http://wtcmanual.wintextware.com/index.html?wl_clearing_user_bookmarks.htm