Hi, thanks for ur reply...to b clear,i have written a perl program for TGDH algorithm..i.e.,whenever a new user joins the dynamic group,a node 'll b created for that user in a tree structure..user entry applet is written in java..only the tree formation program i have written in perl..i need to send the user entry details to be sent to the perl program and the result to b returned to the applet..can any one tell me the format with a simple eg r kindly tell me any reference where i could know abt tat...