When you put a "when I receive" block on the screen sometimes you don't want it you receive it unless you have already received another message. Why couldn't you just put a block that you can put other pieces of code in to do this. I could also be used to stop those programs when it receives another message. I would also love a wait until and repeat until "I recieve ____."
<repeat until><wait until>
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"Repeat Until" and "Wait Until" require Boolean values to be placed inside. Broadcasting cannot be expressed as Boolean, so these blocks are not possible. You can, however, use variables in place of broadcasts, such as 0 is false and 1 is true.
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