# MX\_QLOCK, MX\_QUNLOK

> [HTML Version](mx_q_lock_unlok.htm)

**xcall MIAMEX, MX\_QLOCK**

**xcall MIAMEX, MX\_QUNLOK**

MX\_QLOCK (MIAMEX 67) locks the qflock.sys file. It should be called before trying to read the qflock.sys file, and should then be followed by MX\_QUNLOK.

MX\_QUNLOK (MIAMEX 68) removes the lock on the qflock.sys file which was placed by a prior call to MX\_QLOCK.