Of course you can - simulate right click at exact pixels of chart plus arrows, enter, escape key sequence with user32.dll functions. Without, however, having any option to check if everything went well. And there are no guaranties it will - if terminal is busy it may mix the sequence, Windows may or may not register all of the events as you intended. And you will need to read Microsoft documentation, which may or may not exist for the particular things you need. And if it exist it is such quality that you wish it didn't.
In short - no.
The original question was already answered.
There is a difference.
Yes, you can. For example, you can manage expert advisors from the Market in this way.