In a message dated 2/16/2000 7:28:37 PM Eastern Standard Time, david@acz.org writes: << Notice the context in which the list is posted. This info is described in more detail in the file ti86prot.txt. These are used by the linking protocol. It sends 0x15 when it is getting a "directory", or a listing of vars on the calc. Sort of like when you type 'dir' from the DOS prompt. >> Ok, I understand now. Jeff Barrett