All existing documentation of ConPTY seem to only mention the case where stdin, stdout and stderr are all to be connected to the pty and no STARTF_USESTDHANDLES. The only mention that the proper value to have in StartupInfo.hStdInput et al when STARTF_USESTDHANDLES is active is NULL is indirectly in the documentation for GetStdHandle().

Using STARTF_USESTDHANDLES is useful if you want to keep stdout and stderr separate or want to redirect one of them to eg a file.

An explicit mention in conjunction with STARTUPINFOA and/or PROC_THREAD_ATTRIBUTE_PSEUDOCONSOLE would be appreciated.

Thanks.