Taken from the epsxe.chm The GUI/TAB "File"
RUN PS-EXE
This option is mostly meant for developers or demo programmers who want to try ePSXe with the demos (these are NOT demos of PSX games, but rather technical demos !) floating around on the net.
You can get to the epsxe.chm from the Main GUI by left mouse cliking on the Help Menu and then Contents.