Transfering code from MATLAB to FEMLAB

I have a following code written in MATLAB:

2*postint(fem,'Wm')/postint(fem,'nJ','dl',5,'edim',2)^2

L=2Wm/I^2 is the formula

This is an expression for calculating inductance of square-shaped inductor and I need to do the same thing in FEMLAB, but do not know how.
'nJ' is Current density, but I do not know where to find 'dl' and what number 5 represents?

Please help

Try to write a .dll file: under LabVIEW this method allow to intarface the National's

software with Matlab and C, C++ programs.


So, look how You can manipulate .dll files under FemLAB.

It is not a problem writting a.dll but I simply do not know what means the exspression in second bracket.