Check that a plugin is installed and enabled
94330
How to tell if an add on is present. Using Python
61349
What's the preferred method of writing AJAX-enabled plugins?
24535
Check if device is plugged in
106722
How to install a QGIS plugin when offline?
100017
Check server activity with code
115802
How to programmatically detect if a LaTeX package is installed?
37403
How can I tell when I logged into Windows?
25027
Uninstall, Activate, Deactivate a plugin: typical features & how-to
158918
Check if a file was included or loaded
96579
How to know if extglob is enabled in the current bash session?
135724
How can I know if the set -e option is enabled or not?
99842
Check if images are loaded?
6440
Can I see why a package is installed?
153860
Is there a way to detect if a Lightning Component is running in a Community or in Lightning Experience?
49658
Elegant way to check for missing packages and install them?
95691
How do I check the active solution configuration Visual Studio built with at runtime?
24368
How can I list all files which have been installed by an APT package?