Peter-

Just a quick response to your first question-  you might want to give the 
workflow parameters feature a shot to see if it does what you're looking to do. 
 Within the workflow editor, instead of setting a value to 'specify at 
runtime', use a variable tag in the format ${yourvariablename}.  This variable 
can be reused in as many steps as you want in the workflow, and can also be 
used in the Rename Dataset action if you wanted to tag datasets by the 
parameter used.  See the example from the January news brief for screenshots 
(https://bitbucket.org/galaxy/galaxy-central/wiki/Features/DevNewsBrief/2011_01_31).

-Dannon



On Mar 2, 2011, at 9:40 AM, Peter Cock wrote:

> Hi all,
> 
> I have a multi-step workflow where I've marked some parameters to be
> set at run time (in this case, a minimum read length, used in two
> different workflow steps). I want to use the same parameter value in
> multiple tools, rather than give the user one prompt for each tool. Is
> this possible?
> 
> Related to this, it would be nice to specify a default in the workflow
> (overriding any default in the tool wrapper), and give some caption
> text to the workflow level parameter. I guess some of this
> functionality would be related to any enhancement to make a workflow
> act like a tool (e.g. to combine subworkflows into larger workflows).
> 
> Thanks,
> 
> Peter
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