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From FenixWiki

Definition

A ProcessID is a unique identification code, for one instance of a processtype. A ProcessID is always odd and larger than 65536 (2^16).
This makes it possible to use for example the function collision() in an if() statement. This is because collision() returns the ProcessID the process calling collision() has collided with.

Usage

ProcessID is used when referring to specific process (an instance of a processtype) and access/edit its local variables. The ProcessID of a process is found by on of the following methods:

• Returned when the frame; statement is found in the process.
• Returned by the get_id() function.
• Returned by the collision() function.
• Stored as the local variable id (holds the process' own ProcessID).
• Stored as the local variable father (holds the ProcessID of the process that called the current process).
• Stored as the local variable son (holds the ProcessID of the process last called from the current process).
• Stored as the local variable bigbro (holds the ProcessID of the process called by the father immediately before the current process).
• Stored as the local variable smallbro (holds the ProcessID of the process called by the father immediately after the current process).

The ProcessID can either be used as an argument for a fuction such as get_angle() or get_dist() or as a way of using the local variable of another process. For example, to use the x and y local variables of a process.

Example

Private
    int ballID;
    int ballx;
    int bally;
Begin
    ballID = BallProcess();
    ballx = ball.x;
    bally = ball.y;
End
Process BallProcess( )
Begin
    Loop
        frame;
    End
End

This demonstrates using the period (".") character between the ProcessID and the variable name to access a local variable.

Note that functions do NOT have a ProcessID, as a ProcessID is assigned when the frame; statement is reached in the code, making it a process.