Thanks for the confirmation. Should we perhaps change the zsock man page to 
note this? The use of the word frame in this context can easily be 
misinterpreted to imply compatibility....

       //  Send a 'picture' message to the socket (or actor). The picture is a
       //  string that defines the type of each frame. This makes it easy to 
send
       //  a complex multiframe message in one call. The picture can contain any
       //  of these characters, each corresponding to one or two arguments:
...
       CZMQ_EXPORT int
           zsock_send (void *self, const char *picture, ...);

Thanks,
Joe
 
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    Right, you have to use the zsock-recv/send APIs together - look at the 
implementation if you want to replicate it manually but note that it's not a 
public protocol so it's not guaranteed to stay unchanged. Those APIs are 
intended as a self-contained shortcut.
    
    
    ------------------------------

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