Executing a sql command from PL/SQL block without waiting for return

Using the Win32Api function ExecuteShell(), in VB(etc), I am able to 
execute a command and continue to the next line in my code without waiting 
for that line to complete/return - I am looking for a way to execute a sql 
command (UPDATE statement) within a PL/SQL block which will not wait for 
return of that command before proceeding with the rest of the block. Any 
ideas? 
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