|-<1. My tilde button does not work in pd for Windows, which is quite a pain in |-<the... |-< Am I the only one to have this problem?

hm, try the "keytable" app from the "start->programme->utilities" .. maybe it works in the editor.

|-<2. When starting pd on Linux I get the message "Waiting for connection |-<request". I think my network configuration is right. What do I have to |-<do to stop pd waiting and getting on?

juff, we had this when the lo device was NOT set up proerly do you get a does /sbin/ifconfig lo give you an entry?