Here's one possible and a simple way to link a manual order for Strategy Tester use. Most of us know already that ChartEvent doesn't work with Strategy Tester, and the simplest objects — or should I say the only objects (at this time using basic MQL5 codes) that can be placed on the Strategy Tester are the "label" and the "button". For the label, there's no problem attaching it in, but for the button... even if you manage to place it in the tester, you won't be able to detect its state if clicked or unclicked without using advanced programming and linking it to other systems.
The trick part I used to attain this, is by using a simple file detection process. Think of this EA as a standalone receiver, at every tick movement the EA will keep checking a folder for a file that would trigger an order. If the required text file in a specific folder location is detected, the EA will then execute a command to process the order and delete the file afterwards. Thus, the existence of a certain file in a folder location is the main trigger command to execute a trade.
You can now use any or whatever way you can think of to command the EA to execute the order by just placing a certain file on a folder location.
In this EA, a simple "buy.txt", "sell.txt", or "close.txt" filename in the "...\Common\Files\" folder location of MetaTrader 5 would trigger a command to execute a certain order based on the file's name. The text files are empty, it's the filename that matters and its presence in the folder that counts. The files should appear one at a time in <common_data_folder>\Files (my folder looks like this: C:\Users\Rmd user\AppData\Roaming\MetaQuotes\Terminal\Common\Files\). Only one of the three files must appear at a time inside the folder, if not, the first one that EA reads will be executed, after which the EA deletes any or all files named on the three.
The other outside application you gonna need now is the one that will create or supply you the required text file on the said folder, or you can just simply find a way to transfer the mentioned filename on the target folder location. I've made mine in Visual Basic, I would love to share it but I doubt the site will allow me to upload an executable file here, so best is to create or look for such on your own, it is on any possible way you can think of, just simply place the command text file on the proper folder. Check out the discussion area at the bottom, I'll post how I made my panel.

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