msp <sprite number>,<number>,<number>,<number>

Moves the sprite of the designated number. The other variables, from left to right, are: x, y, transparency.

Like the tal command, and other sprite system commands, msp's results will not show up on screen (this is for ease and speed of batch processing).
So before you call any text or image display commands after an msp, please call a print command to update the screen before continuing.