Can dosxyznrc use a created pegs4 file?

[phantasuson]

I created a new pegs4 data file and tried to load on dosxyznrc. What dose the pop mean?

[ftessier]

This means that the filename of the pegs file you created (located under $EGS_HOME/pegs4/data) is the same as a pegs file distributed with EGSnrc (located under $HEN_HOUSE/pegs/data). It warns you that your file will be selected. This is probably what you want, but to avoid confusion I suggest you select a different filename for your file, for example you could add a my_ prefix. You don't need to recreate the pegs file, just rename it.