Thanks to all of the three respondents ( apparently I can reply to one only.... ).
This is really great help. Indeed, I run Labview 7. Woow, after having run a sequence of various write/read/query commands in I/O Assistant, I can save this sequence and afterwards I can execute the sequence again by opening the myvi.vi. This is exactly what I was looking for ! I am happy, with your help, I could make a modest start in this dazzling program. I even started to ( try to ) wire in the block diagram in order to present the read/query resulting tokens in cute graphs. Not very succesful as yet, but I will find out. Meanwhile I encountered a problem : when I change ( " select instrument " ) in I/O Assistant and execute one or more commands in this second instrument#, this change of instrument# is not executed in the ( saved anew ) myvi.vi. ( BTW : both instruments perform perfectly when sequentially controlled in the I/O Assistant before saving). While executing myvi.vi , whether the bus is not released by one of the two instrument# or the change of instrument# is not part of the saved myvi.vi code. I happened to buy today a HP Bus System Analyzer but I had no time today to learn to read and analyze the bus systems and data messages so soon. Nor can I read the myvi.vi code in alfa numeric tokens ( in order to read whether both instrument# are in the code ). I tried to read the code under Tools etc. but apparently I have to configure something before. OK, I try to find out. Meanwhile, maybe one of you is able and so kind to give me a headstart/hint in the said problem ( " how to use more than one instrument# in I/O Assistant so that all instruments are controlled by executing the saved myvi.vi of these I/O Assistant sequences. Thanks, Peter.