software for simple automation

hello,

i just need to do a simple automation part for my trading as follows:

1. monitor the bids/asks
2. if the bids/asks satify some specified conditions then do 3. and 4.
3. pop up a message and/or play an alert sound (optional but good to have)
4: send some keystrokes

anyone knows any cheap tool/software for this?

any input would be appreciated.
 
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