Dear Greg, this would solve the problem 1a.
For 1b I can define a U32 for SRB_BufPointer. I can create the buffer with "Initialze Array" but I don't know how to assign the address of the array to a U32. I made a look into the "LV Data Storage" but not into the "External Code" document so my knowledge is limited. On this basis I thougth it is not possible with LV to create a Cluster with the same memory layout as the typedef struct and suggested to use a wrapper DLL. Waldemar
