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     The _chdrive function changes the current working drive to the
     drive specified by <drive>. The <drive> argument uses an integer
     to specify the new working drive (1=A, 2=B, etc.).
 
     This function changes only the working drive; the chdir function
     changes the working directory.
 
     In OS/2 protected mode, the working drive is local to a process
     rather than system-wide. When a process terminates, the working
     drive is restored to its original value. Under DOS, the new drive
     set by the program becomes the new working drive.
 
     Return Value
 
     The _chdrive function returns a value of 0 if the working drive is
     successfully changed, or -1 if an error occurs.
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