Hi, please help me in this regard. here Iam facing so many problems while installing my JAVA COMMUNICATIONS API. Iam following all the instructions given in API. Even I have done the as follows : comm.jar ------ it is kept in <jre>\lib\ext folder. javax.comm.properties ---------- it is kept in <jre>\lib folder. win32com.dll ----------- it is kept in <jre>\bin folder. still it is not working and giving the message as follows : "no serial ports found". this is the class path iam setting : .;C:\j2sdk1.4.0_02\lib\dt.jar;C:\j2sdk1.4.0_02\jre\lib\rt.jar;C:\j2sdk1.4.0_02\l ib\tools.jar;c:\j2sdk1.4.0_02\lib\comm.jar;c:\commapi\samples\blackbox\BlackBox. jar;C:\j2sdk1.4.0_02\jre\lib; please let me know the solution to this problem.