What does the "SHORT" mean in this code?
JE SHORT 00013FB8
Short jumps (and near calls) are jumps whose target is in the same module (i.e. they are intramodular, however it is possible to get intermodular variants from certain hacks). They are most commonly up to 127 bytes of relative displacement (they change the flow of execution forward or backward from the address of the instruction), however there are 16bit variants offering 32k bytes.
You don't really need to worry about it much, its really superfluous information, but the intel developer manuals (volumes 2a and 2b, specifically 2a) will cover the gory details.