From Creatures Wikia
There are various CAOS commands to access/change them, OBVx (used in C1 and C2) and OVxx (C2 and above), for accessing the variables of TARG, and MVxx (C3 and above) for accessing the variables of OWNR, where 'x' is replaced by a number (for example, OBV1 for variable 1, or OV12 for variable 12). Creatures 1 has 10 of them, 0 to 9, and the other games have 100, from 0 to 99.
When a script begins running, they are initially all 0 (integer type), but can be assigned any value. Any value!
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