You can search for multiple tags by typing them in the URL separated by %20. This does an AND search, i.e. only questions with all the tags you specified will be shown.

For example:

http://stackoverflow.com/questions/tagged/windows%20com

searches for both the 'windows' and the 'com' tags

Alternatively you can type the following in the search box in the top right for the same results:

[windows] [com]

You can search for multiple tags by typing them in the URL separated by %20. This does an AND search, i.e. only questions with all the tags you specified will be shown.

For example:

https://stackoverflow.com/questions/tagged/windows%20com

searches for both the 'windows' and the 'com' tags

Alternatively you can type the following in the search box in the top right for the same results:

[windows] [com]