The amount of virtual memory Windows is currently using, as reported in the Task Manager dialog under the Performance tab. The Commit Charge fluctuates as applications are opened and closed. TOTAL shows the current amount of virtual memory used, which comprises main memory (RAM) and storage (pagefile). TOTAL is also graphed in real time on the Page File Usage History chart. PEAK is the maximum amount this session, while LIMIT is the maximum amount available unless the pagefile is expanded by Windows. See virtual memory
What Is Committed?
Apparently, a certain amount of virtual memory has been "committed." As for "charge," who knows? What we do know is that people who come up with such names should be "committed" to a place prohibiting them from creating user interfaces.
The Windows Task Manager
The Windows Task Manager shows the status of apps and processes currently running in the computer. Commit Charge TOTAL and LIMIT amounts are displayed at the bottom right. This is a Windows XP example, and the Commit Charge statistics change their location within the Task Manager tabs with each new version of Windows.