BOB stands for blitter object, it means a sprite, just another term from Lee`s Amos days that creeps in
MEMBLOCK stands for memory block, you can allocate a chunk of memory and do tricks with it, like draw images or modify them faster than you could do on the screen, or use them as a big chunk of numbers that describes the tiles on your 1000x1000 map, or copy a model into it and then alter the model "on the fly", memblocks are fast to write/read to and can be used for all sorts of things like that.
Mentor.
PC1: P4 3ghz, 1gig mem, 3x160gig hd`s, Radeon 9800pro w cooler (3rd gfx card), 6 way speakers.
PC2: AMD 2ghz, 512mb ram, FX5200 ultra, 16 bit SB.
Mini ATX cases suck.