That's the command.
Basically, you load the object, and then you can use append object to load the animation data from another file and add it to the existing object. This would be how you use it:
rem load idle model
load object "idle.x" , 1
rem append walk animation
frame = total object frames( 1 ) + 1
append object "walk.x" , 1 , frame
rem append attack animation
frame = total object frames( 1 ) + 1
append object "attack.x" , 1 , frame
Afterwards you can use the object just as I described in my post above.
TheComet