DosGetPPID

Bindings:  C, MASM 

This call allows the caller to obtain the parent process ID for any 
process. 

 DosGetPPID     (PID, PPID) 
 

 PID (USHORT) - input 
    The process ID of the process to find the parent PID. 

 PPID (PUSHORT) - output 
    Address of a word where the process ID of the parent of the indicated 
    process is placed. 

 rc (USHORT) - return 
    Return code descriptions are: 

    0         NO_ERROR 
    303       ERROR_INVALID_PROCID