try using the show and hide commands. just have the position of the hidden object be moved as the shown object moves.
it would then be a process (at least if you wanted it to move) like
load object "man01.3ds",7700
load object "man02.3ds",7701
hide object 7701
do
if upkey() then move object 7700,5
if leftkey() then turn object left 7700,3
if rightkey() then turn object right 7700,3
if downkey() then move object 7700,-5
x#=object position x(7700)
y#=object position y(7700)
z#=object position z(7700)
position object 7701,x#,y#,z#
if spacekey() and object visible(7700)
hide object 7700
show object 7701
endif
if spacekey() and object visible(7701)
hide object 7701
show object 7700
endif
loop
by the way, only tap the space bar.
Sarin