- Tcl_CreateChannelHandler.tcl86(3), Tcl_CreateChannelHandler(3), Tcl_DeleteChannelHandler(3)
- call a procedure when a channel becomes readable or writable
- Tcl_CreateChannelHandler.tcl90(3), Tcl_CreateChannelHandler(3), Tcl_DeleteChannelHandler(3)
- call a procedure when a channel becomes readable or writable