How to use USDFLD request variables from other elements in ABAQUS

Hi all,

 I want to use USDFLD to have diffusion and mechanical coupling analysis. The model is building a cohesive zone between two parts. Before the calculation is  executed in each increment, I need to get the stress information of last increment of one element and the other two element next to it in the same cohesive zone. After geting this, I can update the parameters of cohesive zone and a following mechanical analysis will be executed. How can I save the variables of desired elements for each increment? Or how can I request other elements' information in the USDFLD subroutine ?