QUESTION
 Does VisualAge support OS/2 multi-threading?

ANSWER
 You can create multi-threaded-like applications through the use     
 of Smalltalk processes.  Although the processes actually run        
 under a single thread, calls to external functions                  
 can run on a thread separate from the base Smalltalk.               
 Although the ability to access all OS/2 APIs does exit,             
 some functions such as semaphores are implemented inside            
 Smalltalk to support its scheduling of processes.                   
 When you call external code from VisualAge, all of VisualAge's      
 processing and the external function's processing are executed      
 on a single thread. This means that while the function is being     
 run, processing for the rest of VisualAge is halted, including      
 processing for the normal operation of VisualAge's user interface.  
 To overcome this problem, VisualAge enables you to reroute the      
 execution of any external functions onto a separate thread          
 so that normal processing can continue while the function is        
 running.                                                            
 Threads are not functional in Windows.                              
 For more info on threads and methods in PlatformFunction class  
 used to call external functions, refer to the User's Guide      
 and Reference Chapter 21 p. 293.