On my unix box everytime I use the underbar character "_" I run into trouble
when using it to concatenate two names. The OS reads in the underbar and
looks to the next character, handling it differently.

On one of your replies, someone demonstrated correctly that when you
concatenate, keep the other names plus the underbar character all within
double quotes. That way, the OS will treat the underbar as a literal character instead of (probably) a meta-character.