Pat Implicit in what you are postulating here is that the logic behind the real or emulated 3270 half-session actually cares whether or not there has been some prior agreement that the presence of the extended data stream capability is understood by both parties. I believe this is *not* the case.
Thus, even without the complications of TN3270E, it is not required that there should have been an exchange of BINDs with the query bit followed by the "Read Partition Query" exchange for the primary half-session, whether on the LU-LU session or the SSCP-LU session, to attempt to invoke all the wonderful capabilities of the 3270 data stream. Clearly the whole process is more reliable if permission to use any functions over and above the basic ones which can always be assumed is sought first. It was precisely this requirement which caused me to limit my adventures with colouring USS messages to the basic 4 colours[1] and to look askance at my colleague's USS 10 messages with their potentially unsupported 7 colours. If the programming using VTAM is clever GDDM tasked with creating, for examples, circles on the display surface, it had better know a whole lot about the rendering capabilities of the display logic before creating the necessarily rather specialised data stream. Clearly in this case, it behoves GDDM to use the "Read partition Query" exchange in order to obtain the required parameters. However, I guess chancing your arm brightening up text with 7 colours might not be too messy if the capability happens not be there. Chris Mason [1] I did use red for I think the application name in the string LOGON APPLID( name ) LOGMODE( mode ) DATA( data ) which I placed at the bottom of the screen and where the constant text was protected but with the modify bit set. In order to ensure that this constant text was ignored when using the usual compressed command "earlier" in the display buffer I think I was obliged to insert a hidden modified blank - I forget the details now. However, this "trick" does illustrate that the inbound USS data stream is stripped of non-text characters before it is analysed - which the manual may actually say in some dark corner. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
