*get,nnn,node,0,nxth
*dowhile,nnn
*get,uydisp,node,nnn,u,y
*get,nnn,node,0,nxth
[...] ! do whatever you need to do with nnn and uydisp
*enddo
or without the gets:
nnn=ndnext(0)
*dowhile,nnn
uydisp=uy(nnn)
nnn=ndnext(nnn)
[...] ! do whatever you need to do with nnn and uydisp
*enddo