As of PowerBuilder 12.5.x, there are two functions in the SoapConnection class for the .NET Web services engine only:
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EnablePreAuthentication- Applies only to webservices that use basic authentication mechanism. Call this function to pre-authenticate the request. Syntax: <conn>.EnablePreAuthentication()
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SetKeepAlive- Whether to make a persistent connection to the Internet resource. Syntax: <conn>.SetKeepAlive(Boolean <value)