How the driver, bundle, EC stream, MCL, and MCFs interact with each other is shown in  Figure 10-21. By design, all MCLs can be applied concurrently, including: By design and with planning, MCLs can be activated concurrently. Consider the following  points: Figure 10-21 Microcode terms and interaction MCL Application GLYPH<SM590000> During MCL Bundle application. GLYPH<SM590000> During Enhanced Driver Maintenance (Concurrent Driver Upgrade). For example, for z14  at Driver 32, the original GA level, upgrade from Driver 32 to Driver 36 (also applicable to  z14 ZR1).  GLYPH<SM590000> Most MCLs activate concurrently when applied. GLYPH<SM590000> A few MCLs are “Pended” for scheduled activa tion because activation is disruptive in  some way (Recent History: Most commonly seen for traditional OSA-Express features or  Crypto-Express features). GLYPH<SM590000> Activate traditional I/O Feature Pended MCL – LIC on the hardware feature: – Display Pending MCLs using HMC functionor Resource Link Machine Information  Reports MCL Activation Chapter 10. Hardware Management Console and Support Element  435