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]