At your command
Definition 1 of 2
Pro Tip 1/3Immediate Accessibility
Indicates that something can be used as soon as it's needed. 
All the tools you need are at your command.
Pro Tip 2/3Personal Advantage
Suggests a personal benefit or enhancement due to immediate access to something. 
With that information at your command, you're at an advantage.
Pro Tip 3/3Authority Implication
Implies having the authority to utilize something directly and without asking for permission. 
As project leader, you have all the data at your command.