Yes, you should be able to do this from the module code. See the block_example code at http://api.drupal.org/api/function/block_example_block/6
Note the 'pages' array element (in the example code it is specified as 'node/*'). In your case, you would want to set this to 'admin/build/modules'
Best,
William
Hello,
Is it possible to define block to show only in module pages?
I would like to define that in module code - is it possible?
Thank you in advance,
Ktt