difference btw lofi and _lofi

Hi all,

can you pls tell me the difference btw,

LOFI_FAILED and _LOFI_FAILED

these 2 are just variables in the script its used...it just stores values...

However i have this vague idea that _LOFI_FAILED is something different ..
in the sense that it starts from a _...
so could that be some sort of a command...
like,
exit and _exit (used in c/c++)