Every time you save a project, events are stored in the history list, along with active and inactive breakpoints, to a file named <projectname>.ehl in the project directory. The following example shows an .ehl file:
[Events] A[0]->GEN(evCount())'Default::A A[0]->GEN(evOn())'A A[0]->GEN(evDeep())'Default::A A[0]->GEN(evOn())'Default::A [Active Breakpoints] [Inactive Breakpoints]