The comparisons that can be made are: greater than (>), greater than or equal to (>=), less than (<), less than or equal to (<=), Crossover, and Crossunder.
For example, if you wanted to code a strategy where one the entry condition was to only enter was RSI is above the RSI signal line, you would input it like this:
If you wanted to create a strategy that only enters on the EXACT BAR that an EMA crosses over or under another EMA, you would use the 'CROSSOVER' or 'CROSSUNDER' condition.