code: private boolean isWindowLimitExceeded(FrameData dataFrame) {
          if (streamWindowUpdateWriteLimit - dataFrame.getPayloadLength() < 0 ||
              muxLink.getWorkQ().getConnectionWriteLimit() - dataFrame.getPayloadLength() < 0) {
              // would exceed window update limit
              String s = "Cannot write Data Frame because it would exceed the stream window update limit."
                         + "streamWindowUpdateWriteLimit: " + streamWindowUpdateWriteLimit
                         + "\nstreamWindowUpdateWriteInitialSize: " + streamWindowUpdateWriteInitialSize
                         + "\nconnection window size: " + muxLink.getWorkQ().getConnectionWriteLimit()
                         + "\nframe size: " + dataFrame.getPayloadLength();
              if (TraceComponent.isAnyTracingEnabled() && tc.isDebugEnabled()) {
                  Tr.debug(tc, s);
              }
              return true;
          }
          return false;
      }
docs: Check to see if a writing out a frame will cause the stream or connection window to go exceeded
  
  @return true if the write window would be exceeded by writing the frame