Relative tolerance vs Relative Error

Hi all,

having read many relevant threads and also searched in the comsol manual , i still dont understand the difference (if there is indeed some) between relative error and relative tolerance.

for example:
1)in this thread (also in manual)
www.comsol.com/community/forums/general/thread/13157

''The Relative tolerance value is the relative error tolerance that the ODE solver uses.''
''Use the Relative tolerance edit field to enter a positive number. This number controls how accurately the nonlinear system of equations is solved in each time step. In general, the desired relative error in the solution should be entered here.''

2)in comsol manual
''The software stops the iterations when the relative tolerance exceeds the relative error computed as the weighted Euclidean norm''
suggesting a difference

i need some clarification
V4.4

Thanks in advance